The Math Dude makes understanding math easier and more fun than you ever thought possible. Host Dr. Jason Marshall provides clear explanations of math terms and principles, and his simple tricks for solving basic algebra problems will have even the most mathphobic looking forward to working out whatever math problem comes their way. If you're getting ready to take the SAT, GRE, or any of the other standardized tests; or if you're going back to school and need to brush up on the basics, Math Dude's Quick and Dirty Tips to Make Math Easier will strengthen your fundamental skills and help you understand the language of math. And if you just want to calculate the tip without using your iPhone and impress all your friends, his tips and tricks are for you too.

300 TMD Math Is a Playground…So Play!

What’s the point of learning math? Why is it so important that kids are exposed to mathematical thinking? And what do parents and teachers need to know about learning real math? Keep on listening to find out! Read the full transcript here: http://bit.ly/2mINl8z

2/24/2017 • 7 minutes, 2 seconds

077 TMD How Are Distances and Absolute Values Related?

Learn how to use absolute values to find distances between numbers and places. Read the full transcript here: http://bit.ly/2lPuJQ7

2/18/2017 • 6 minutes, 58 seconds

299 TMD How to Use Math to Fly Rockets to Space

What does it really mean for a satellite to orbit the Earth? What’s the math behind it? And what’s the math behind the rockets that get those satellites into orbit? Keep on listening to find out! Read the full transcript here: http://bit.ly/2l9sIAz

2/10/2017 • 7 minutes, 57 seconds

227 TMD Polygon Puzzle: How Many Degrees Are In a Polygon?

How many degrees are in the interior angles of a pentagon? Or a hexagon? An octagon? Or any polygon? Keep on listening to The Math Dude to learn how to solve this polygon puzzle! Visit the website: http://bit.ly/1IF5Uu1

2/3/2017 • 6 minutes, 26 seconds

298 TMD The Simple Math Behind Crunching the Sizes of Crowds

How large was the crowd at the recent U.S. presidential inauguration? Or the inauguration 8 years ago? Or at last Saturday’s Women’s March in Washington D.C.? Keep on listening to find out how crowd sizes are estimated. Read the full transcript here: http://bit.ly/2kAq43R

1/27/2017 • 7 minutes, 8 seconds

226 TMD Math Tips for Smart Shopping

Would you rather get a 33% bigger coffee for no extra charge or pay 33% less for the regular size? Do you know how to avoid being tricked into buying more than you need? Keep on listening to The Math Dude to learn about the numbers behind savvy shopping. Read the transcript: http://bit.ly/1FiHHNz

1/20/2017 • 6 minutes, 46 seconds

250 TMD How to Measure Time Without a Stopwatch

How can you measure time without using a stopwatch? You could use the movement of the Sun across the sky, you could watch a pendulum swing, or you could burn some very special string. Keep on listening to find out how it works! Read the full transcript here: http://bit.ly/1E8ZcuF

1/13/2017 • 6 minutes, 26 seconds

297 TMD 4 More FAQs About Percentages

How do you quickly calculate 25% of a number? Or 33% of a number? Or 50%? And how can you quickly calculate percentage increases? Keep on listening to learn the answers to these frequently asked questions about percentages. Read the full transcript here: http://bit.ly/2i46GPA

1/6/2017 • 9 minutes, 58 seconds

193 TMD The 5 Steps of Problem Solving

Do "word problems" make you cower in fear? Do you ever find yourself stuck on math problems before you even get started? If so, keep on listening because Math Dude's simple 5-step method for solving math problems can help! Read the full transcript here: http://bit.ly/2hZORNn

12/30/2016 • 7 minutes, 31 seconds

296 TMD How Many Gifts Are In the 12 Days of Christmas?

How many gifts should one's true love be given on each of the 12 Days of Christmas? If you stick to the recommendations from the classic song, the answer can be calculated using a bit of clever math. Keep on listening to find out how. Read the full transcript here: http://bit.ly/2hDDkm7

12/23/2016 • 9 minutes, 39 seconds

179 TMD Christmas Math 101

How long does Santa have to hang out when he's dropping presents off at your house? And how fast do his reindeer fly? Keep on listening to find out about the incredible math behind Santa's magical night! Read the full transcript here: http://bit.ly/2iEKwAa

12/16/2016 • 5 minutes, 51 seconds

295 TMD What Is the Probability that Alien Life Exists?

Are we alone in the universe? If so, why? If not, where is everybody? Thankfully, math can help us with these astronomically profound questions. Keep on listening to learn all about the probability of extraterrestrial life. Read the full transcript here: http://bit.ly/2isqx83

12/9/2016 • 9 minutes, 45 seconds

127 TMD How to Quickly Calculate Percentages

Learn a quick and dirty tip to help you calculate pesky percentages in your head. Read the full transcript here: http://bit.ly/2h6A1rU

12/2/2016 • 7 minutes

294 TMD How Are Turkeys and Extraterrestrials Related?

How many turkeys are consumed each year in the U.S. on Thanksgiving? And how many extraterrestrial civilizations might exist in the universe? Umm…wait…what?! Although these seem like unrelated questions, they’re not. As we'll soon find out, they’re united by math. Read the full transcript here: http://bit.ly/2fUBPnD

11/25/2016 • 8 minutes, 18 seconds

134 TMD What Are Mixed Fractions?

Learn what mixed fractions are and find out how they're related to regular fractions.

11/18/2016 • 5 minutes, 54 seconds

293 TMD Why Were the 2016 U.S. Presidential Polls Wrong?

The 2016 U.S. presidential election is over. And if you'd been following the polls, the results might have been surprising. What went wrong with those polls? It has to do with statistical and systematic uncertainties. Read the full transcript here: http://bit.ly/2gnNRpX

11/11/2016 • 9 minutes, 2 seconds

206 TMD How Big Is the Universe?

The solar system is big, the distances between stars bigger, and the distance to the center of the galaxy in which we live is even bigger than that. But all of that is tiny compared to the distance to the edge of the known universe! Just how big is that? The Math Dude breaks it all down. Visit the website to read the full transcript: http://bit.ly/UBERxy

11/4/2016 • 7 minutes, 12 seconds

292 TMD How to Think About the Size of the Earth

Do you have a good feel for the size of the Earth? If you’re like most people, you know that it’s big but you don’t have a sense for exactly how big. Today we’re going to change that! Read the full transcript here: http://bit.ly/2eVwubz

10/28/2016 • 6 minutes, 57 seconds

210 TMD 5 More Tips for Understanding Weights and Measures

How much is a gram? An ounce? Or a ton? If you don't have an intuitive feel for exactly how much mass these quantities represent, keep on listening! Read the full transcript here: http://bit.ly/2dWyR0G

10/21/2016 • 6 minutes, 37 seconds

291 TMD How Does Geometry Explain the Phases of the Moon?

What causes the Moon to change phases throughout the month? Why is it sometimes visible only during the day and other times only at night? What’s the relationship between these times and the Moon’s phases? The answer in all cases is geometry. Keep on listening to find out how it works! Read the full transcript here: http://bit.ly/2ebEjeY

10/14/2016 • 8 minutes, 21 seconds

221 TMD What Are Polygons? (Reissue)

What do a triangle, a rectangle, and a pentagon all have in common? They’re all polygons. What makes a polygon a polygon? And why do they matter? Keep on listening to find out! Visit the website: http://bit.ly/1ANCZEg

10/7/2016 • 6 minutes, 46 seconds

290 TMD How to Win Every Bet

Richard Wiseman, author of 101 Bets You Will Always Win, joins Math Dude, to talk about how to use probability and mathematics to win bets. Read the full transcript here: http://bit.ly/2dkwBio

9/30/2016 • 8 minutes, 21 seconds

204 TMD What Is Angular Size?

How good are your eyes at seeing really tiny things that are really far away? How much better is the Hubble Space Telescope at doing the same thing? What do these two questions have to do with the mathematical concept of angular size? Keep on listening to find out! Read the full transcript here: http://bit.ly/2d9FpGH

9/23/2016 • 6 minutes, 29 seconds

289 TMD How to Use Geometry to Calculate the Size of Earth

Can you think of a way to measure the size of the Earth? Or the distance to the Sun? Or the nearest star? Want to know how ancient Greek mathematicians did exactly this over 2,000 years ago? Keep on listening to find out! Read the full transcript here: http://bit.ly/2duvgGw

9/16/2016 • 8 minutes, 27 seconds

257 TMD 3 Numerical Fun Facts About NFL Football

What do uniform numbers tell you about NFL players? How can you estimate how fast a wide-receiver is running? Read the full transcript here: http://bit.ly/1Vc3ZZs

9/9/2016 • 6 minutes, 30 seconds

288 TMD What Is a Light Year?

Do you know what a light year really measures? Do you know why so many people find it confusing? And why they shouldn’t? Keep on listening to find out! Read the full transcript here: http://bit.ly/2cRCALY

9/2/2016 • 7 minutes, 9 seconds

197 TMD What Are the Odds of Successfully Navigating an Asteroid Field?

What are the odds of successfully flying through an astroid field like the one in the movie The Empire Strikes Back? Are they really 3,720 to 1 as suggested by C-3PO? Or are they much worse…or perhaps better? Keep on listening to find out. And May the 4th be with you! Read the full transcript here: http://bit.ly/2c4TRBc

8/26/2016 • 6 minutes, 51 seconds

287 TMD Why Are There Ties in Olympic Swimming?

Did you notice all the ties in the swimming events of this year's Olympics? Did you wonder why they didn't (or maybe couldn't) simply use more precise timing to break the ties? Not surprisingly, the answer is math. Keep on listening to find out why! Read the full transcript here: http://bit.ly/2bpLSA4

8/19/2016 • 6 minutes, 55 seconds

229 TMD How FOIL Can Help Your Math Skills

Have you heard of FOIL? Not the aluminum kind, but the one that can help your multiply faster? Keep on listening to The Math Dude to learn more! Read the transcript: http://bit.ly/1K6g33D

8/12/2016 • 9 minutes, 8 seconds

286 TMD 5 Numerical Fun Facts About the Olympics

How fast do Olympic swimmers swim and Olympic sprinters sprint? How do these speeds compare to the speed at which you could race walk to the games? Or fly there in an airplane? Keep on listening to find out! Read the full transcript here: http://bit.ly/2aVf5MZ

8/5/2016 • 7 minutes, 59 seconds

205 TMD How Big Is the Solar System?

How big are the planets of the Solar System compared to the enormous Sun at its center? How far would you have to travel to reach each of them? And how can you build your own scale model of the Solar System to see all of these relative sizes for yourself? Keep on listening to find out!

7/29/2016 • 6 minutes, 12 seconds

285 TMD What Are Polynomials?

What are polynomials? How are they built? What can you do with them? And why are they important? Keep on listening to find out! Read the full transcript here: http://bit.ly/2alOY5e

7/22/2016 • 8 minutes, 28 seconds

235 TMD Phone Keypad Number Puzzle

You know your phone’s keypad is arranged into three rows and three columns of numbers, but did you know there’s a pretty cool math puzzle hidden in there, too? Keep on listening to The Math Dude to find out how to solve it! Read the transcript: http://bit.ly/1LqGcjm

7/15/2016 • 8 minutes, 7 seconds

284 TMD 4 Numerical Fun Facts About the Juno Spacecraft

Did you hear the exciting news that NASA just successfully put the Juno spacecraft into orbit around Jupiter? Want to learn 4 super-cool numerical fun facts about this mission? Then keep on listening! Read the full transcript here: http://bit.ly/29EqQdy

7/8/2016 • 7 minutes, 21 seconds

211 TMD How to Use Google as a Calculator

What's the cube root of 29? The sine of 55 degrees? Or the value of π/4? Do you need to search for your trusty calculator or pull out your phone to find out? No—you can just ask Google. Keep on listening to The Math Dude to find out how. Read the full transcript here: http://bit.ly/29L8kiU

7/1/2016 • 6 minutes, 32 seconds

283 TMD How to Solve the Famous Coffee and Cream Puzzle

Summer is brain-teaser season in my house. And since summer has now officially arrived, it’s officially brain-teaser season for The Math Dude. What’s the puzzle for today? Keep on listening to find out! Read the full transcript here: http://bit.ly/29spCmZ

6/24/2016 • 6 minutes, 37 seconds

231 TMD What Is a Nautical Mile?

Have you ever heard of a nautical mile? Have you ever wondered what in all the world’s oceans that could be? Keep on listening to The Math Dude to learn about the math behind the nautical mile - and its close seafaring relative, the knot. Read the transcript: http://bit.ly/1Cb0CTp

6/17/2016 • 6 minutes, 51 seconds

282 TMD How to Prove the Pythagorean Theorem

What does the Pythagorean Theorem tell us about triangles? Is it always true? And how can you prove this famous theorem arts-and-crafts style? Keep on listening to find out! Read the full transcript here: http://bit.ly/28OoVnq

6/10/2016 • 8 minutes, 20 seconds

234 TMD How to Estimate Hours Left Until Sunset

Did you know that math can help you survive? I’m not talking about the jobs, money, and feeding yourself kind of surviving—I’m talking about the lost in the wilderness, life depends on it kind. How? Keep on listening to The Math Dude to find out. Read the transcript here: http://bit.ly/1GcVCUV

6/3/2016 • 5 minutes, 43 seconds

281 TMD How to Think About Division: Part 2

What does it mean to divide an integer by a fraction? Or a positive number by a negative number? Or even a negative number by another negative number? Keep on listening to find out! Read the full transcript here: http://bit.ly/1UjRl4y

5/27/2016 • 8 minutes, 27 seconds

216 TMD Why Does a Triangle Have 180 Degrees?

How many degrees do the three angles of a triangle contain? They've got 180 of 'em, right? Why 180 and not some other number? And do all triangles really contain 180 degrees? Keep on listening to find out! Read the transcript: http://bit.ly/11fbwwv

5/20/2016 • 6 minutes, 45 seconds

280 TMD How to Think About Division: Part 1

What does it really mean to divide two numbers? Or two variables? How can you visualize these processes? And how are they related to the process of multiplication? Keep on listening to find out! Read the full transcript here: http://bit.ly/1Xqsr88

5/13/2016 • 7 minutes, 32 seconds

198 TMD The Equation for a Happy Mother's Day

What's the most important holiday in May? Obviously it's Mother's Day. Did you know there's an equation that can help you celebrate? Keep on reading to find out what it is! Read the full transcript here: http://bit.ly/1Og53su

5/6/2016 • 6 minutes, 56 seconds

279 TMD How to Think About Multiplication: Part 2

What does it mean to multiply a positive number by a negative number? What does it mean to multiply two negative numbers? How about two variables? Or lots and lots of variables? Keep on listening to find out! Read the full transcript here: http://bit.ly/1rqtjO9

4/29/2016 • 7 minutes, 45 seconds

129 TMD How to Simplify Fractions

Learn how to simplify the fractions in your life. Read the full transcript here: http://bit.ly/1VGjSXN

4/22/2016 • 6 minutes, 17 seconds

278 TMD How to Think About Multiplication: Part 1

What happens when you multiply one number by another? Is there a right answer to this question? What does it tell us about how you should think about multiplication? Keep on listening to find out! Read the full transcript here: http://bit.ly/21oazeO

4/15/2016 • 7 minutes, 12 seconds

030 TMD How to Use Math to Send Encrypted Messages

Learn what one-time pad encryption is, how it has been used throughout history, and how to use math to send your own encrypted messages. Questions go to [email protected]. Like what you hear? Help us out by writing a review at iTunes! Read the full transcript: http://bit.ly/UZqPpb

4/8/2016 • 7 minutes, 13 seconds

277 TMD 3 Numerical Fun Facts About the NCAA Tournament

How can you quickly figure out how many games are needed to determine the winner of a tournament? What are the odds of predicting the winner of each and every game? And how does this explain why your NCAA tournament bracket was so wrong? Keep on listening to find out! Read the full transcript here: http://bit.ly/1N9qjPU

4/1/2016 • 8 minutes, 21 seconds

213 TMD What Are the Odds of Winning the Lottery?

What are the odds of winning the Mega Millions lottery jackpot and striking it rich? How long would you need to play before having a 50-50 chance of winning? Keep on listening to find out! Read the full transcript here: http://bit.ly/21M7fZl

3/25/2016 • 7 minutes, 31 seconds

276 TMD How to Think About Subtraction: Part 2

Do you really know what subtraction is? By which I mean do you really feel it in your gut? Here's part two of the series that will help you do so! Read the full transcript here: http://bit.ly/1q7Pus0

3/18/2016 • 7 minutes, 1 second

190 TMD 3.14 Fun Facts About Pi

Happy Pi Day 2014! What is pi? Why does it have its own holiday? And what are some fun (and useful) facts to know about this famous number? Keep on listening to find out! Read the transcript here: http://bit.ly/1MmsaKU

3/11/2016 • 7 minutes

275 TMD How to Think About Subtraction: Part 1

What is subtraction? Like its close cousin addition, you no doubt “know" the answer to this question. But do you really feel the answer in your gut? Keep on listening to find out how you can! Read the full transcript here: http://bit.ly/1R1J5oQ

3/3/2016 • 8 minutes, 44 seconds

138 TMD How to Add and Subtract Like an Egyptian

Learn how the ancient Egyptians used hieroglyphics to do math. Read the full transcript here: http://bit.ly/1XTw70S

2/26/2016 • 6 minutes, 33 seconds

274 TMD How to Think About Addition

What is addition? Of course you know the answer to this question, but do you really feel the answer—do you feel addition deep down in your gut? Keep on listening to find out how! Read the full transcript here: http://bit.ly/1piyuyQ

2/19/2016 • 8 minutes, 11 seconds

196 TMD How Is Rainfall Measured?

How is rainfall measured? What does it mean when it rains an inch? And how many gallons of water fall on your roof in a storm? Keep on listening to learn all about the math behind April showers and May flowers. Read the full transcript here: http://bit.ly/1Tg26cZ

2/12/2016 • 6 minutes, 30 seconds

273 TMD How to Combine Like Terms

Do you know what “like terms” in algebra are? Do you know the best way to think about them? And how to combine them? Keep on listening to find out! Read the full transcript here: http://bit.ly/1K72Y09

2/5/2016 • 8 minutes, 34 seconds

114 TMD How Many Grains of Sand are on Earth's Beaches?

Learn to use math to quickly estimate tough-to-calculate numbers. Read the full transcript here: http://bit.ly/1NYWIlK

1/29/2016 • 7 minutes, 9 seconds

272 TMD What Does Half-Life Mean?

What are half-lives? And what do they have to do with measuring the age of the solar system and predicting the effects of a morning cup of coffee? Keep on listening to find out! Read the full transcript here: http://bit.ly/1NzcdAN

1/22/2016 • 7 minutes, 59 seconds

271 TMD What Do Analog and Digital Mean?

What do the terms “analog” and “digital” mean? What are some of the analog and digital things in your life? And what does this have to do with math? Keep on listening to find out! Read the full transcript here: http://bit.ly/1TmF6aC

1/15/2016 • 6 minutes, 36 seconds

270 TMD What Is a Pie Chart?

Did you know that a lot of people in the world think that pie charts are a really terrible kind of chart? Keep on listening to find out why! Read the full transcript here: http://bit.ly/1K9DkHF

1/8/2016 • 8 minutes, 8 seconds

028 TMD How to Use Statistics to Understand Poll Results

Learn how to use statistics to understand the significance of the latest political polling results and to keep yourself from being duped by misleading information. Questions go to [email protected] or 206-339-6279. Like what you hear? Help us out by writing a review at iTunes!

1/1/2016 • 6 minutes, 52 seconds

269 TMD How to Use Histograms to Fix Your Pictures

Have you ever adjusted the exposure and brightness of a photo? Did you know you were really adjusting your picture’s photo histogram? Keep on listening to find out how it works! Read the full transcript here: bit.ly/1kNvSpN

12/25/2015 • 7 minutes, 58 seconds

268 TMD How to Use Histograms to Take Better Pictures

What can a histogram tell you about a photo? How can it help you take better pictures? And how can it improve the pictures you’ve already taken? Keep on listening to find out! Read the full transcript here: bit.ly/1ZOF9xJ

12/18/2015 • 6 minutes, 42 seconds

267 TMD What Is a Histogram?

Do you know how to make a histogram? When to make one? And what you can learn from it once you do? Keep on listening to find out! Read the full transcript here: http://bit.ly/1RXVpKg

12/11/2015 • 8 minutes, 9 seconds

266 TMD What Is a Bar Graph?

What are bar graphs? How do you make them? And what are they useful for? Keep on listening to find out! Read the full transcript: http://bit.ly/22eO3GG

12/4/2015 • 7 minutes, 14 seconds

222 TMD Thanksgiving and Black Friday After-Math

How much turkey do Americans eat on Thanksgiving? How fast can a turkey run? And how much money do Americans spend in the days following their big feast? Keep on listening to The Math Dude to learn all about the math behind Thanksgiving and Black Friday. Visit the website: http://bit.ly/1w47J2P

11/27/2015 • 6 minutes, 38 seconds

265 TMD How to Use Stem-and-Leaf Plots

Why are stem-and-leaf plots useful? How are they related to the kind of stems and leaves that fall from trees this time of year? Keep on listening to find out! Read the full transcript here: http://bit.ly/1k7iUTj

11/20/2015 • 7 minutes, 4 seconds

264 TMD What Are Stem-and-Leaf Plots?

How do you make stem-and-leaf plots? Why might you want to? How are they related to the stems and leaves that fall from trees? Keep on listening to find out! Read the full transcript here: http://bit.ly/1Yn3YmQ

11/13/2015 • 7 minutes, 38 seconds

263 TMD How to Solve Archimedes’ Volume Puzzle

Have you ever heard the story of Archimedes and his famous “Eureka!” moment? Want to know how to use his discovery to measure the volume of a pumpkin … or anything else? Keep on listening to find out! Read the full transcript here: http://bit.ly/1TV1juj

11/6/2015 • 7 minutes, 10 seconds

172 TMD Halloween Math and More Percentage Questions

How can you figure out what number 200 is 17% of? How do you calculate the original price of something before a 30% markup? What math makes the Halloween holiday go round-and-round? Keep on listening to learn the answers to these frequently asked questions about percentages! Visit the website: http://bit.ly/1tEiypA

10/30/2015 • 6 minutes, 27 seconds

262 TMD How to Find the Volume of a Pumpkin

How can you find the volume of a pumpkin? How is this related to finding the volume of an ellipsoid? And what does any of this have to do with Archimedes’ famous “Eureka!” moment? Keep on listening to find out! Read the full transcript here: http://bit.ly/1LF1vLp

10/23/2015 • 8 minutes, 56 seconds

261 TMD How to Resolve Zeno’s Paradox

Who do you think would win a race between the mighty Greek warrior Achilles and a very clever tortoise? Obviously, Achilles would clobber the tortoise…or would he? The answer might surprise you. Read the full transcript here: http://bit.ly/20ecKlM

10/16/2015 • 8 minutes, 28 seconds

260 TMD What Is a Mathematical Limit?

Do you know what a limit is in math? Do you know how to define a circle using this idea? And do you know why you might want to? Keep on listening to find out! Read the full transcript here: http://bit.ly/1OGpDzn

10/9/2015 • 8 minutes, 12 seconds

259 TMD What Is Euler's Number?

What makes an exponential an exponential? Are any exponentials more special than others? And what does Euler's number have to do with any of this? Stay tuned for the answers. Read the full transcript here: http://bit.ly/1Q5YIft

10/2/2015 • 9 minutes

258 TMD What Is Exponential Growth?

Have you ever heard that something is growing exponentially? Or that it's accelerating at an exponential pace? Or that it's getting exponentially better? What does exponentially really mean? Read the full transcript here: http://bit.ly/1OWNLPP

9/25/2015 • 8 minutes, 56 seconds

256 TMD Imaginary Numbers in the Real World

Although every complex number has a so-called “imaginary" part, in many ways they're just as “real” as real numbers. And complex numbers have many real uses in the real world. Read the full transcript here: http://bit.ly/1UTHZx2

9/11/2015 • 8 minutes, 30 seconds

255 TMD What Are Vectors?

Behind every acceleration you make and every press on the brake is a vector. Behind the arrangement of each limb on a tree and the flight of a bumblebee is a vector. So what are vectors? Keep on listening to find out! Read the full transcript here: http://bit.ly/1UTnshp

9/4/2015 • 6 minutes, 51 seconds

254 TMD What Are Complex Numbers?

What do you get when you put a real and an imaginary number together? A complex number. No, not a complicated number (although it kind of is), we’re talking about an entirely new set of numbers dubbed “complex.” Read the full transcript here: http://bit.ly/1JLrpJk

8/28/2015 • 7 minutes, 22 seconds

253 TMD What Are Imaginary Numbers?

Have you ever heard of imaginary numbers? Have you always thought they must be some kind of made-up numbers that don't have anything to do with reality? Well think again! Keep on listening to learn where imaginary numbers come from. Read the full transcript here: http://bit.ly/1XdehXC

8/21/2015 • 7 minutes, 55 seconds

252 TMD How to Use the Stars to Find Your Latitude

Have you ever wondered how people figured out their latitude back in the days before the Internet? Did you know you can use the same math trick they used to pinpoint your latitude today? Keep on listening to find out how it works! Read the full transcript here: http://bit.ly/1J81caV

8/14/2015 • 6 minutes, 56 seconds

251 TMD How to Calculate Density

What does density measure? What are the densities of common things like air and water? How can you tell if something will float in a bathtub? Keep on listening to find out. Read the full transcript here: http://bit.ly/1hOOB3l

8/7/2015 • 7 minutes, 15 seconds

249 TMD 3 Tips for Calculating Percentages

How quickly can you calculate 25% of 70? Or 40% of 50? Or 75% of 160? Keep on listening to learn 3 easy tips for calculating percentages. Read the full transcript here: http://bit.ly/1JPjawn

7/24/2015 • 8 minutes, 23 seconds

248 TMD 3 More Numerical Fun Facts About Pluto

How big does the Sun look from Pluto? How bright would it be? And, if you could travel to Pluto, what would the sky look like? Keep on listening to find out! Read the full transcript here: http://bit.ly/1ON2WIh

7/17/2015 • 6 minutes, 49 seconds

247 TMD 5 Numerical Fun Facts About Pluto

How far away is Pluto? How many years does it take to fly there? How long does Pluto take to orbit the Sun? How fast is it traveling? And how fast is the New Horizons spacecraft on its way to Pluto traveling? Keep on listening to find out! Read the full transcript here: http://bit.ly/1MyrUcY

7/10/2015 • 9 minutes, 51 seconds

111 TMD How to Find the Distance to Fireworks and Thunderstorms

Learn how to find the distance to fireworks and thunderstorms.

7/3/2015 • 7 minutes, 22 seconds

246 TMD Martin Gardner's 3 Penny Puzzle

Are you a fan of brain teasers? If so, you’ll love today’s probability puzzler. And if not, hopefully you will be a fan after today. Regardless, have fun! Read the full transcript here: http://bit.ly/1BVkwrx

6/24/2015 • 6 minutes, 32 seconds

245 TMD Why Does a Circle Have 360 Degrees?

Where do the 360 degrees of a circle come from? When did this way of divvying up a circle come into common practice? Who made this choice? And why? Keep on listening to find out. Read the full transcript here: http://bit.ly/1C6qQNe

6/19/2015 • 7 minutes, 15 seconds

244 TMD What Are Combinations? Part 2

What amazingly clever trick can help you count combinations of objects? How does it relate to our quest to find the total number of hypothetically colored rainbows? Keep on reading to find out. Read the full transcript here: http://bit.ly/1LfmeUA

6/12/2015 • 8 minutes, 42 seconds

243 TMD What Are Combinations? Part 1

In math, sometimes order matters, and sometimes it doesn’t. When it comes to permutations and combinations, it matters a lot. Keep on reading to find out why. Read the full transcript here: http://bit.ly/1N0u4mo

6/6/2015 • 8 minutes, 2 seconds

242 TMD What Are Permutations?

Combinations and permutations. Permutations and combinations. What's the difference between the two? And how do you calculate each of them? Keep on listening to find out! Read the full transcript here: http://bit.ly/1Q4Sctq

5/30/2015 • 7 minutes, 55 seconds

241 TMD How to Solve the Famous Clock Puzzle

How many times each day do the minute and hour hands of a clock cross? At precisely what time does each crossing occur? Keep on listening to learn how to solve this famous math puzzle! Read the full transcript here: http://bit.ly/1K83N60

5/21/2015 • 8 minutes, 30 seconds

173 TMD You Are NOT Bad at Math

What's the secret to being good at math? If you think it's all about being blessed with good math genes, think again. Keep on listening to find out what being good at math is really all about.

5/15/2015 • 6 minutes, 47 seconds

240 TMD How to Think About Small Numbers, Part 2

Now that we know how to think about size scale as small as 0.000001 meter, it’s time to shrink ourselves down even more and think about really, really small sizes. How small? Keep on listening to find out. Read the full transcript here: http://bit.ly/1BIYuTJ

5/9/2015 • 6 minutes, 59 seconds

239 TMD How to Think About Small Numbers, Part 1

How can you understand the sizes of numbers that are unimaginably minuscule? By shrinking yourself down to an equally unimaginable tiny size! How does that help? Keep on listening to find out. Read the full transcript here: http://bit.ly/1FSmc3L

5/2/2015 • 6 minutes, 57 seconds

011 - What are Numerators and Denominators?

Learn a quick tip to help you understand exactly what the numerator and denominator of a fraction tell you.

4/24/2015 • 6 minutes, 21 seconds

238 TMD The Infamous “Cheryl’s Birthday” Puzzle

Who is Cheryl? Why has the world suddenly become obsessed with finding her birthday? And when is it? Keep on listening to The Math Dude to learn how to solve this viral math puzzle and determine Cheryl’s birthday. Read the transcript: http://bit.ly/1cSitcI.

4/18/2015 • 8 minutes, 28 seconds

237 TMD When Is the Next Leap Year?

When is the next leap year? Why do we ever need to leap? And how much do we leap at a time? Keep on listening to The Math Dude to find out! Read the transcript here: http://bit.ly/1GE7AaJ

4/11/2015 • 7 minutes, 9 seconds

109 TMD How to Square Two-Digit Numbers in Your Head

Learn how to quickly and easily calculate the square of any two-digit number in your head. Read the episode transcript here: http://bit.ly/1y9x5y0.

4/3/2015 • 7 minutes, 28 seconds

236 TMD A Perplexing Geometry Fun Fact

A golf ball and the Earth walk into a belt shop and ask how much longer their belts would need to be if they gained an extra inch or two around the middle. The answer will almost certainly surprise you. Keep on listening to The Math Dude to find out why! Read the transcript here: http://bit.ly/1CqsS7k

3/28/2015 • 6 minutes, 53 seconds

162 TMD 5 Tips for Faster Mental Multiplication

Ever dreamed of being able to multiply numbers lickety-split…and completely in your head? Wouldn't it be great if you could quickly solve problems like 36 x 25 and 47 x 24? Good news—you can! Keep on reading to find out how. Check out the transcript here: http://bit.ly/1CWbJ9a

3/20/2015 • 8 minutes, 4 seconds

233 TMD How to Draw Perfect Angles

If you were handed a piece of string and a pencil, could you draw perfect (or nearly perfect) 30 and 60 degree angles? Why might this be a useful skill? Keep on listening to find out! Read the transcript here: http://bit.ly/1Bo56M0

2/20/2015 • 6 minutes, 57 seconds

232 TMD Valentine’s Day Math

How many grains of sand are on Earth? How many stars are in the universe? How many atoms does our planet contain? What do these numbers have to do with how much you love your Valentine? Keep on listening to find out! Read the transcript here: http://bit.ly/17ORfkZ

2/13/2015 • 7 minutes, 47 seconds

230 TMD How to Calculate Arc Length

Do you know what an arc is? Do you know that an arc has a length? And do you know how to calculate that arc length - or why you might want to? Keep on listening to The Math Dude to find out! Read the transcript: http://bit.ly/1z79wiw

1/31/2015 • 6 minutes, 43 seconds

228 TMD 3 Tips for Subtracting Quickly

When can addition speed up subtraction? What’s the most important trick for lightning quick mental subtraction? And what’s the fastest way to check your work? Keep on listening to The Math Dude to find out! Read the transcript: http://bit.ly/1xv1YGJ

1/16/2015 • 7 minutes, 43 seconds

180 TMD New Year Math Fun Facts

How many different New Year's Eve countdowns are there around the world? When do astronauts celebrate New Year's? Who celebrates first? And last? Keep on listening to learn all about these New Year's math fun facts. Read the transcript: http://bit.ly/1BF8zRE

1/2/2015 • 5 minutes, 15 seconds

225 TMD 2 More Tips for Adding Quickly

What does subtraction have to do with lightning quick addition? And how can splitting numbers up into 2 or more smaller numbers make for faster addition? Keep on listening to The Math Dude to find out! Read the transcript: http://bit.ly/1JKzQs2

12/20/2014 • 7 minutes, 28 seconds

224 TMD 3 Tips for Adding Quickly

What do speed reading and speedy arithmetic have in common? What’s the fastest way to come up with approximate answers to addition problems? And how can multiplication help you add faster? Keep on listening to The Math Dude find out! Visit the website: http://bit.ly/1zuWHTY

12/13/2014 • 7 minutes, 17 seconds

223 TMD How to Find the Center of a Circle

Ever needed to find the center of a circle? It’s one of those things that seems easy...until you need to figure out how to do it. But rest assured there is a trick, and it's indeed fairly simple. Keep on listening to The Math Dude to find out more! Visit the website: http://bit.ly/1ud9CDc

12/6/2014 • 6 minutes, 32 seconds

220 TMD Martin Gardner’s Best Math Puzzles (Part 2)

Want to learn a fun number trick? More importantly, want to learn the math behind why it works? Want to know how to figure out the arrangement of six marbles with only a single clue? Or the smallest number of cuts needed to turn one big cube into 27 smaller ones? Keep on reading to find out!

11/15/2014 • 9 minutes, 50 seconds

219 TMD Martin Gardner’s Best Math Puzzles (Part 1)

If you’re into math and logic puzzles, you have probably heard of Martin Gardner. And if you’re not into those kinds of puzzles, you should be! The Math Dude highlights some of this math master's best teasers, for both novices and experts. Visit the website: http://bit.ly/14erBE1

11/8/2014 • 9 minutes, 15 seconds

218 TMD What Is a Great Circle?

Have you ever heard of a great circle? How about a small circle? Do the lines of longitude on Earth form great circles? How about the lines of latitude? How do these ideas explain the routes that airplanes fly? Keep on listening to find out! Read the transcript: http://bit.ly/1tALfDt

10/25/2014 • 7 minutes, 25 seconds

217 TMD What Are Euclidean and Non-Euclidean Geometry?

How many degrees are in the angles of a triangle? What’s the shortest distance between two points? Do seemingly parallel lines ever cross? Think you know the answers? Think again! Keep on listening to find out why. Read the transcript: http://bit.ly/1ySDuw1

10/18/2014 • 7 minutes, 54 seconds

215 TMD All About Triangles

What's the difference between equilateral, isosceles, and scalene triangles? How about obtuse, right, and little acute ones? Keep on listening to find out! Read the transcript: http://bit.ly/1CSnpWB

10/4/2014 • 6 minutes, 13 seconds

214 TMD How to Calculate the Area of a Triangle

What's the area of a triangle? Half its base times its height, right? Indeed, that's the formula. But why? Keep on listening to learn the secret behind this famous formula for the area of a triangle. Read the transcript: http://bit.ly/1CDTC3R

9/27/2014 • 5 minutes, 56 seconds

212 TMD 3 More Tips for Using Google as a Calculator

Did you know that you can use Google to convert from miles to kilometers, and a bunch of other things? And did you know that you can use it to quickly graph functions? Keep on listening to The Math Dude to find out how!

9/13/2014 • 6 minutes, 13 seconds

209 TMD 5 Tips for Understanding Weights and Measures

How much is a fluid ounce? How about a milliliter? Or a gallon? If you don't have an intuitive feel for exactly how much volume these quantities represent, keep on listening! Read the transcript: http://bit.ly/1lw33ya

8/23/2014 • 6 minutes, 6 seconds

208 TMD How to Solve the Famous Birthday Problem

What are the chances that two players on the same soccer team share a birthday? How about two students in the same algebra class? Both seem pretty unlikely, right? The answer might surprise you!

8/16/2014 • 8 minutes, 33 seconds

207 TMD Are Mass and Weight the Same Thing?

Is your mass the same as your weight? If not, what's the relationship between these two ideas? And why do so many people get them confused? Keep on listening to find out! Visit the website to read the full transcript: http://bit.ly/1q8RPv4

8/9/2014 • 6 minutes, 26 seconds

137 TMD How to Multiply and Divide Mixed Fractions

Learn how to multiple and divide mixed fractions like a math pro.

7/18/2014 • 5 minutes, 37 seconds

136 TMD How to Add and Subtract Mixed Fractions

Learn how to add and subtract mixed fractions like a math pro.

7/18/2014 • 6 minutes, 47 seconds

203 TMD How to Think About Astronomically Large Numbers

How big is the number 1 million? 1 billion? Or 1 million billion? How can you think about these and even larger numbers so that you actually comprehend their immense sizes? Keep on listening to find out!

6/21/2014 • 7 minutes, 4 seconds

202 TMD World Cup Math

How many teams are playing in the 2014 World Cup? How many countries have ever won it? What are the odds that Brazil, this year's host country and 5-time winner, will win again? Keep on reading to find out and learn all about the math behind the World Cup.

6/14/2014 • 5 minutes, 34 seconds

201 TMD How to Prove There Are Infinite Prime Numbers?

What's the biggest prime number? Is it the 17,425,170 digit prime discovered in January 2013? While that may be the largest prime number known today, it's certainly not the biggest...because there isn't a biggest! How do I know? Keep on listening to find out.

6/7/2014 • 7 minutes, 18 seconds

200 TMD What Is Math, Really?

What is math? Numbers, shapes, logic, stuff like that, right? Sure, but what do all of these things have in common? In other words, what is math...really? Keep on reading to find out!

5/30/2014 • 6 minutes, 53 seconds

078 TMD How to Use Math to Land Your Dream Job

Find out why graduating from college isn't an excuse to forget all the math you've learned.

5/23/2014 • 7 minutes

199 TMD How to Prove That 1 = 2?

Did you know that 1 = 2? Think that sounds ridiculous? OK, I'll prove it to you. Then I'll show you why this "proof" is indeed, as you suspected, ridiculous. And we'll see what it all has to do with the number zero.

5/17/2014 • 7 minutes, 26 seconds

195 TMD What Is the Famous Monty Hall Problem?

Ever heard of the Monty Hall problem? If so, did the world famous brain teaser leave you flummoxed? If not, how does getting flummoxed—and then just as quickly un-flummoxed—sound? I hope you're up for the challenge (and the fun) because that's exactly what's in store for today!

4/19/2014 • 6 minutes, 32 seconds

194 TMD What Physics Recently Discovered About the Big Bang

You've probably heard about the recent discovery made by scientists in the South Pole. But what was it exactly and what does it mean for us? Math Dude explains.

4/11/2014 • 8 minutes, 51 seconds

192 TMD What Do Sine Functions Look Like?

What does the graph of a sine function look like? And how are sine functions related to the changing number of daylight hours throughout the year? Keep on listening to find out!

3/29/2014 • 6 minutes, 53 seconds

191 TMD How Many Minutes of Daylight Do We Gain or Lose Each Day?

How many minutes of daylight does the northern hemisphere gain every day in March? How about in June? What's the astronomical reason for these changes? Keep on listening to find out!

3/22/2014 • 6 minutes, 5 seconds

189 TMD What Are the Odds of Predicting a Perfect NCAA Tournament Bracket?

What are the odds of winning Warren Buffet's $1 billion prize for picking the perfect 2014 NCAA tournament bracket? Should Mr. Buffet be worried about his money? And how are the odds of winning related to the famous rice and chessboard problem? Keep on listening to find out!

3/8/2014 • 7 minutes, 24 seconds

188 TMD 3 Frequently Asked Questions About Modular Arithmetic

How should you think about subtraction and negative numbers in modular arithmetic? How does the modulo operator work in terms of the order of operations? Keep on listening to learn the answers to these questions and more!

3/1/2014 • 7 minutes, 14 seconds

187 TMD What Are the Domain and Range of a Function?

What are the domain and range of a function? What's the vertical line test for functions? And what's the best way to picture the meaning of a function in the first place? Keep on listening to find out!

2/22/2014 • 8 minutes, 41 seconds

186 TMD What Are Functions?

What is y = 3x - 2? An equation? Or maybe a function? Could it possibly be both? Keep on listening to learn all about functions and to find out how they're different from equations.

2/15/2014 • 6 minutes, 23 seconds

185 TMD How to Use Trigonometry to Measure the Height of a Tree

Have you ever wondered if sines, cosines, and tangents are actually useful in the real world? If so, wonder no more! Today we're going to learn how the wonderful tools of trigonometry can be used to estimate the height of a tree.

2/8/2014 • 6 minutes, 30 seconds

184 TMD 3 Super Bowl Fun Facts

Want to amaze your friends at that Super Bowl party you're going to? All you have to do is hit 'em with some Super Bowl math fun facts. Keep on listening to find out what I mean!

2/1/2014 • 6 minutes, 17 seconds

183 TMD What Are Radians and Degrees?

What's the difference between radians and degrees? Where did these units for measuring angles come from? And how do you convert from one to the other? Keep on listening to find out!

1/25/2014 • 6 minutes, 35 seconds

182 - What Are Sine, Cosine, and Tangent?

What do sines, cosines, and tangents have to do with right triangles? And what are the "sin," "cos," and "tan" buttons on your calculator for? Keep on listening to find out!

1/17/2014 • 5 minutes, 52 seconds

181 TMD The World of Trigonometry

You've probably heard of sine, cosine, and tangent before. But do you actually know what they are? While they sound like complicated ideas, they're really not. Keep on reading to learn more about the origins and uses of trigonometry.

1/11/2014 • 5 minutes, 41 seconds

178 TMD The Magic of Number 9 (Part 2)

The number 9 is kind of amazing. How amazing? Listen for the exciting conclusion to Math Dude's story about the magical number 9.

12/14/2013 • 6 minutes, 36 seconds

177 TMD The Magic of Number 9 (Part 1)

Have you ever noticed that the number 9 is kind of amazing? What's that…did I hear you say "NO?" Then prepare yourself to be amazed and keep on listening to learn all about the magic behind the mysterious number 9.

12/7/2013 • 7 minutes, 14 seconds

176 TMD 3 Frequently Asked Questions About Math Puzzles

Think of a number, add 3, double it, now subtract 4, divide by 2, and finally subtract your original number from the result. You get 1, right? How do I know? And what are some other fun math tricks that you can use to amaze your friends? Keep on listening to find out!

11/29/2013 • 8 minutes, 20 seconds

175 TMD How to Make a Graph (Part 2)

How do you turn a bunch of data into a super-handy graph? Keep on listening to learn the final 2 steps in my easy 4-step method for making graphs.

11/23/2013 • 7 minutes, 48 seconds

174 TMD How to Make a Graph (Part 1)

What are graphs? When are they useful? And how do you make one? Keep on listening to learn an easy 4-step method for making graphs.

11/16/2013 • 7 minutes, 47 seconds

108 TMD Is There a Difference Between Odds and Probability?

Grammar Girl joins us to ask two grammar-related math questions.

11/1/2013 • 6 minutes, 16 seconds

171 TMD How to Calculate with Significant Figures

How do addition, subtraction, multiplication, and division work when you're dealing with significant figures? Keep on listening to find out!

10/19/2013 • 7 minutes, 9 seconds

170 TMD How to Identify Significant Figures

How many significant figures does the number 1.25 have? What about 1.255? Or 1.250? What's the quick and dirty method that you can use to find out? Keep on listening for Math Dude's significant tricks!

10/11/2013 • 7 minutes, 35 seconds

169 TMD What Are Significant Figures?

Do you know what significant figures are? Or why they matter? And what do significant figures have to do with making measurements and calculating things like speed and miles per gallon? Keep on listening to find out!

10/4/2013 • 6 minutes, 34 seconds

168 TMD 3 Frequently Asked Questions About Percentages

What's the percent increase in a population if it goes from 900 to 981? How can you figure out what 200 is 17% of? Keep on listening to learn the answers to these and more frequently asked questions about percentages!

9/28/2013 • 6 minutes, 58 seconds

167 TMD Accuracy Versus Precision

Is there a difference between accuracy and precision? Is one more important than the other? When do the ideas of accuracy and precision show up in the real world? Keep on listening to find out!

9/20/2013 • 6 minutes, 40 seconds

166 TMD How to Round Numbers (Part 2)

How do you round a number like pi = 3.14159 to the nearest thousandths place? Normally, the 5 means you round up, right? But are there ever times when you should round it down? Does any of this matter in the real world? Keep on listening to find out!

9/14/2013 • 7 minutes, 5 seconds

123 TMD What Is Pascal's Triangle? Part 1

Learn how to draw Pascal's triangle and find out what it has to do with the probability of tossing coins.

8/23/2013 • 7 minutes, 31 seconds

096 TMD How to Write Small Numbers with Scientific Notation

Learn how scientific notation can be used to make reading and writing small numbers easier.

8/9/2013 • 7 minutes, 38 seconds

165 TMD How to Round Numbers (Part 1)

How do you round an integer like 723 to the nearest ten? How about rounding a decimal number like 3.14159 to the nearest hundredth? Is rounding numbers ever actually useful in the real world? Keep on listening to find out!

8/6/2013 • 6 minutes, 16 seconds

164 TMD 5 Tips for Faster Mental Division (Part 2)

Have you ever wished you could divide numbers quickly and easily in your head? Believe it or not, you can! Keep on listening to learn my final 2 tips for becoming a mental division maestro.

7/25/2013 • 7 minutes, 9 seconds

163 TMD 5 Tips for Faster Mental Division (Part 1)

Have you ever wished you could divide numbers quickly and easily in your head? Believe it or not, you can! Over the next two weeks, listen and learn my top 5 tips to help you become a mental division maestro.

7/25/2013 • 7 minutes, 25 seconds

161 TMD How to Subtract Quickly

Quick, what’s 212 - 22? If that’s too easy for you, how about something tougher like 212 - 77? Want to learn an easy way to perform lightning fast subtraction in your head? Keep on listening to find out!

7/11/2013 • 6 minutes, 36 seconds

160 TMD How to Square Numbers Quickly

Quick, what’s 25 squared? If that’s too easy for you, how about something tougher like 37 squared? Or 111 squared? Want to learn an easy way to calculate these squares and the square of any other number? Keep on reading to find out!

7/6/2013 • 6 minutes, 9 seconds

159 TMD A 4-Step Guide to Solving Equations (Part 2)

Learn how to solve equations in four easy steps.

6/28/2013 • 8 minutes, 41 seconds

158 TMD A 4-Step Guide to Solving Equations (Part 1)

Learn how to solve equations in four easy steps.

6/21/2013 • 6 minutes, 58 seconds

157 TMD How To Solve Equations (Part 2)

Learn the golden rule for solving equations.

6/14/2013 • 7 minutes, 20 seconds

156 TMD How to Picture the Meaning of Algebra

Learn how to picture the meaning of the Pythagorean Theorem.

6/7/2013 • 7 minutes, 12 seconds

155 TMD What Is the Pythagorean Theorem?

Learn what the Pythagorean Theorem is and why it's useful.

5/31/2013 • 6 minutes, 36 seconds

154 TMD Why Is Algebra Useful?

Learn why algebra is useful in daily life.

5/24/2013 • 6 minutes, 17 seconds

153 TMD How To Solve Equations (Part 1)

Learn how to think about and solve equations.

5/17/2013 • 5 minutes, 31 seconds

152 TMD What Are Equations?

Learn what equations are and what they mean.

5/10/2013 • 5 minutes, 40 seconds

086 TMD How to Convert Between Fahrenheit and Celsius

Learn how to easily convert temperatures from Fahrenheit to Celsius.

5/3/2013 • 5 minutes, 35 seconds

151 TMD What Are Algebraic Expressions?

Learn how to use variables to write algebraic expressions.

4/26/2013 • 4 minutes, 59 seconds

150 TMD What Are Variables? (Part 2)

Learn how variables work and how to work with variables.

4/19/2013 • 5 minutes, 35 seconds

149 TMD What Are Variables? (Part 1)

Learn how variables work and how to work with variables.

4/12/2013 • 4 minutes, 59 seconds

148 TMD What Is Algebra?

Learn the secret to understanding algebra.

4/5/2013 • 6 minutes, 32 seconds

147 TMD How Do Computers Add? (Part 3)

Learn how computers and calculators add numbers.

3/29/2013 • 5 minutes, 51 seconds

146 TMD How Do Computers Add? (Part 2)

Learn how computers and calculators add numbers.

3/22/2013 • 6 minutes, 21 seconds

145 TMD How Do Computers Add? (Part 1)

Learn how computers and calculators add numbers.

3/15/2013 • 5 minutes, 25 seconds

097 TMD What is Pi?

Learn what pi is with an arts-and-crafts project and find out why pi is celebrated on March 14.

3/8/2013 • 6 minutes, 7 seconds

144 TMD What Is Boolean Algebra?

Learn how Boolean algebra works and find out why it's important.

3/1/2013 • 6 minutes, 15 seconds

143 TMD How to Add Binary Numbers

Learn how to add binary numbers.

2/22/2013 • 7 minutes, 4 seconds

142 TMD What Are Binary Numbers? Part 2

Learn how to solve a few binary number brain teasers.

2/15/2013 • 8 minutes, 13 seconds

141 TMD What Are Binary Numbers? Part 1

Learn what binary numbers are and how to count in binary.

2/8/2013 • 6 minutes, 52 seconds

140 TMD How to Add and Subtract Roman Numerals

Learn how to add and subtract like an ancient Roman.

2/1/2013 • 8 minutes, 23 seconds

139 TMD What Are Roman Numerals?

Learn where Roman numerals came from and find out how to use them.

1/25/2013 • 6 minutes, 56 seconds

135 TMD How to Turn Mixed Fractions Into Improper Fractions

Learn how to convert between mixed fractions and regular improper fractions.

12/28/2012 • 7 minutes, 11 seconds

133 TMD How to Compare Fractions

Learn how to compare fractions and figure out which one is largest and smallest.

12/14/2012 • 6 minutes, 19 seconds

132 TMD What Is the Lowest Common Denominator?

Learn how to find the lowest common denominator of two or more fractions.

12/7/2012 • 7 minutes, 20 seconds

131 TMD What Is the Least Common Multiple?

Learn how to find the least common multiple of two or more numbers.

11/30/2012 • 6 minutes, 14 seconds

130 TMD How to Find Common Denominators

Learn how to find a common denominator of two fractions.

11/23/2012 • 6 minutes, 48 seconds

128 TMD How to Factor Numbers

Learn how to factor numbers and find prime factors.

11/9/2012 • 7 minutes, 41 seconds

126 TMD How to Quickly Add the Integers From 1 to n

Learn how to quickly add all the integers from 1 to any number. SPONSOR: Try GotoMeeting with HDFaces Today Free for 30 Days!

10/19/2012 • 8 minutes, 30 seconds

125 TMD How to Quickly Add the Integers From 1 to 100 - Part 1

Learn to amaze your friends by quickly adding the integers from 1 to 100.

10/12/2012 • 7 minutes, 12 seconds

124 TMD What Is Pascal's Triangle? Part 2

Learn about the amazing patterns hidden within Pascal's triangle.

10/5/2012 • 6 minutes, 51 seconds

122 TMD How to Calculate Probabilities, Part 2

Learn how to solve last week's brain teaser and use probability trees to calculate probabilities.

9/21/2012 • 7 minutes, 37 seconds

121 TMD How to Calculate Probabilities, Part 1

Learn how to use probability trees to calculate probabilities.

9/14/2012 • 7 minutes, 35 seconds

120 TMD What Are Probability Trees?

Learn what probability trees are and how to make them.

9/7/2012 • 8 minutes, 9 seconds

119 TMD What Is Probability?

Learn how to understand probability by flipping coins and find out how it affects the world.

8/31/2012 • 6 minutes, 10 seconds

118 TMD What Are Moving Averages? Part 2

Learn about some of the different kinds of moving averages that you can use in daily life.

8/24/2012 • 7 minutes, 2 seconds

071 TMD How to Amaze Your Friends With Number Tricks

Learn how number tricks work and how you can use them to amaze your friends.

8/17/2012 • 5 minutes, 29 seconds

117 TMD What Are Moving Averages? Part 1

Learn what moving averages are and when you should use them in your daily life.

8/10/2012 • 8 minutes, 4 seconds

116 TMD What Is the Circumference of a Circle?

Learn how the equation for the circumference of a circle is used in the Olympic games.

8/3/2012 • 6 minutes, 39 seconds

115 TMD Olympic Math Boot Camp

Learn the math behind the Summer Olympic Games.

7/27/2012 • 7 minutes, 14 seconds

113 TMD What is the Higgs Boson Particle? Part 2

Learn what a Higgs boson is and how statistics helped discover it.

7/13/2012 • 8 minutes, 18 seconds

112 TMD What is a Higgs Boson? Part 1

Learn what a Higgs boson is and why its discovery is important.

7/6/2012 • 6 minutes, 59 seconds

110 TMD What Are Prime and Composite Numbers?

Learn some amazing facts about prime and composite numbers.

6/15/2012 • 6 minutes, 48 seconds

107 TMD The Math of a Solar Eclipse

Learn about the mathematical coincidence responsible for solar eclipses.

5/25/2012 • 7 minutes, 1 second

106 TMD How to Work and Play with PEMDAS

Learn a mnemonic to help you remember the rules of PEMDAS and play a fun game based upon those rules.

5/18/2012 • 6 minutes, 1 second

105 TMD What is PEMDAS?

Learn how square roots are used in the real world and how you can easily estimate their value in your head.

5/11/2012 • 7 minutes, 22 seconds

104 TMD How to Calculate Square Roots in Your Head

Learn how square roots are used in the real world and how you can easily estimate their value in your head.

5/4/2012 • 6 minutes, 53 seconds

103 TMD What are Square Roots?

Learn what square roots are and what pitfalls to watch out for when calculating them.

4/27/2012 • 7 minutes, 7 seconds

102 TMD Why Math Isn't an Awful Nerd, Part 2

Learn how to solve a positively odd brain teaser puzzle and find out why math is most definitely not awful.

4/20/2012 • 6 minutes, 21 seconds

101 TMD How to Look for Patterns in Numbers

Learn how to find patterns in sequences of numbers.

4/13/2012 • 7 minutes, 56 seconds

100 TMD Why Math Isn't an Awful Nerd, Part 1

Learn how to have fun with math by solving math puzzles and find out why math is definitely not an awful nerd.

4/6/2012 • 7 minutes, 28 seconds

099 TMD How to Estimate Pi with Monte Carlo Methods, Part 2

Learn about an amazing math technique called a Monte Carlo method and find out how you can use it to estimate the value of pi.

3/24/2012 • 7 minutes, 25 seconds

098 TMD How to Estimate Pi with Monte Carlo Methods, Part 1

Learn about an amazing math technique called a Monte Carlo method and find out how you can use it to estimate the value of pi.

3/16/2012 • 5 minutes, 17 seconds

094 TMD How to Memorize Numbers, Part 3

Learn the final part of a memory trick for remembering numbers.

2/17/2012 • 6 minutes, 15 seconds

093 TMD How to Memorize Numbers, Part 2

Learn the second half of a memory trick for remembering numbers.

2/10/2012 • 6 minutes, 55 seconds

092 TMD How to Memorize Numbers, Part 1

Learn a memory trick for remembering numbers.

2/3/2012 • 7 minutes, 19 seconds

091 TMD What Do Negative Exponents Mean?

Learn what negative exponents and an exponent of zero mean.

1/27/2012 • 8 minutes, 52 seconds

090 TMD How to Divide Numbers with Exponents

Learn how to divide numbers that have exponents.

1/20/2012 • 7 minutes, 32 seconds

089 TMD How to Multiply Numbers with Exponents

Learn how to multiply two or more numbers that have exponents.

1/13/2012 • 7 minutes, 5 seconds

088 TMD What Is Scientific Notation?

Learn what scientific notation is and why it's useful.

1/6/2012 • 6 minutes, 28 seconds

033 TMD Is Multiplication the Same as Repeated Addition?

Learn what it really means to multiply two numbers and whether or not you should think of multiplication as repeated addition. Questions go to [email protected] or 206-339-6279. Like what you hear? Help us out by writing a review at iTunes!

12/30/2011 • 6 minutes, 53 seconds

087 TMD How to Adjust Your Holiday Recipes

Learn how to easily halve or double your recipes.

12/16/2011 • 5 minutes, 14 seconds

085 TMD How Are Check Digits Used in the Real World?

Learn how check digits are used to verify everything from the numbers on your credit cards to the UPC codes on the products you buy.

12/2/2011 • 6 minutes, 38 seconds

084 TMD What is "Casting Out Nines"? Part 3

Learn the magic behind how casting out nines works. SPONSOR: http://stitcher.com/math. Use the code MATH to be entered to win $1000.

11/25/2011 • 5 minutes, 55 seconds

083 TMD What Is Casting Out Nines? Part 2

Learn more about using casting out nines to check your arithmetic.

11/18/2011 • 6 minutes, 31 seconds

082 TMD What Is "Casting Out Nines"? Part 1

Learn how to use casting out nines to quickly and easily check your answers to arithmetic problems

11/11/2011 • 7 minutes, 2 seconds

081 TMD How to Check Your Arithmetic, Part 2

Learn how to quickly check your answers to arithmetic problems.

10/28/2011 • 7 minutes, 25 seconds

080 TMD How to Check Your Arithmetic, Part 1

Learn how to quickly and easily check your answers to arithmetic problems without using a calculator.

10/21/2011 • 6 minutes, 57 seconds

079 TMD How to Multiply and Divide Negative Numbers

Learn how to perform multiplication and division with negative numbers.

10/14/2011 • 7 minutes, 4 seconds

032 TMD How to Use Math to Make Estimates

Learn how to use math to make estimates, why it is an important skill for you to develop, and how you can use math to solve everyday problems in your life. Questions go to [email protected] or 206-339-6279. Like what you hear? Help us out by writing a review at iTunes!

9/30/2011 • 6 minutes, 40 seconds

076 TMD What are Absolute Values?

Learn what absolute values are and how to find them.

9/16/2011 • 6 minutes, 47 seconds

075 TMD Tips to Boost Your Business Math Skills, Part 2

Learn 3 more tips that will turn you in to a business math star.

9/2/2011 • 7 minutes, 30 seconds

074 TMD Tips to Boost Your Business Math Skills, Part 1

Learn 3 tips that'll help turn you into a business star.

8/26/2011 • 7 minutes, 7 seconds

007 TMD Making Sense of Definitions and Interpretations in Math

How precise is math? Although numbers are exact, terms are not always so well defined. Some concepts and terms have multiple meanings or interpretations, and it pays to understand the differences between them. Questions go to [email protected] or 206-339-6279. Like what you hear? Help us out by writing a review at iTunes!

8/19/2011 • 7 minutes, 1 second

073 TMD How to Use Venn Diagrams to Solve Problems

Learn how to make and use Venn diagrams.

8/12/2011 • 6 minutes, 15 seconds

072 TMD What is a Venn Diagram?

Learn how to make and use Venn diagrams.

8/5/2011 • 6 minutes, 28 seconds

008 TMD Two Tips to Help You Add Quickly

Learn two quick and dirty tips to help you kick your calculator dependency and make faster calculations in your head. Questions go to [email protected] or 206-339-6279. Like what you hear? Help us out by writing a review at iTunes!

7/29/2011 • 4 minutes, 44 seconds

070 TMD What are Real Numbers?

Learn how real numbers relate to the rest of the numbers in math.

7/15/2011 • 6 minutes, 42 seconds

069 TMD What are the Union and Intersection of Sets?

Easy ways to find the union and intersection of sets.

7/8/2011 • 6 minutes, 38 seconds

068 TMD What are Sets and Subsets?

Learn what sets and subsets are to understand the relationships between numbers in math and where they show up in the real world.

7/1/2011 • 6 minutes, 45 seconds

067 TMD How to Use Mathematical Series in the Real World

Learn how mathematical series and the compound interest formula can be used in the real world to calculate how fast money grows in recurring investments.

6/24/2011 • 7 minutes, 53 seconds

066 TMD How to Calculate How Fast Your Money Will Grow

Learn what recurring investments are, how to use the compound interest formula to calculate how much money they make, and how you can calculate how fast your money will grow.

6/17/2011 • 7 minutes, 15 seconds

065 TMD What is a Mathematical Series?

Learn what mathematical series are, why they're important, and how you can visually picture the meaning of some series.

6/10/2011 • 7 minutes, 25 seconds

064 TMD How to Use the Compound Interest Formula

Learn how to use the compound interest formula and how it's related to the rule of 72.

6/3/2011 • 7 minutes, 33 seconds

063 TMD What is the Compound Interest Formula?

Learn what the compound interest formula is, how it's related to exponents, and how it can help you make money.

5/27/2011 • 9 minutes, 6 seconds

012 TMD Use the Power of Ten Percent to Easily Calculate How Much to Tip

Learn how to use the power of ten percent, and not your calculator, to easily and quickly calculate how much to tip. Questions go to [email protected] or 206-339-6279. Like what you hear? Help us out by writing a review at iTunes!

5/27/2011 • 7 minutes, 15 seconds

062 TMD What are Exponents?

Learn what exponents are, how to write them, how they are related to the words squared and cubed, and why there's an exponent controversy.

5/13/2011 • 6 minutes, 4 seconds

061 TMD How to Use the Rule of 72 to Find the Time it Takes to Double Your Money

Learn what the rule of 72 is and how you can use it to estimate how long it will take you to double your investment.

5/6/2011 • 6 minutes, 14 seconds

044 TMD How to Multiply Quickly

Learn what the distributive property means in the real world and how it can help you perform lightning fast multiplication in your head. Questions go to [email protected] or 206-339-6279. Like what you hear? Help us out by writing a review at iTunes!

4/29/2011 • 6 minutes, 37 seconds

060 TMD What is the Associative Property?

Learn what the associative properties of addition and multiplication are, and how they can help speed up arithmetic.

4/22/2011 • 5 minutes, 33 seconds

059 TMD What is a Mobius Strip?

Learn what Mobius strips are, how to make them, and why they are such strange and interesting objects.

4/15/2011 • 7 minutes, 31 seconds

058 TMD How to Tell If a Number is Divisible by 7, 8, or 9

Learn how to test if a number is divisible by 7, 8, or 9, and find out why each of these divisibility tests actually work.

4/8/2011 • 7 minutes, 28 seconds

057 TMD How to Tell If a Number is Divisible by 4, 5, or 6

Learn how to test if a number is divisible by 4, 5, or 6, and find out why each of these divisibility tests actually work.

4/1/2011 • 6 minutes, 5 seconds

056 TMD How to Tell If a Number is Divisible by 2 or 3

Learn how to test if a number is divisible by 2 or 3, and find out why each of these divisibility tests actually work.

3/25/2011 • 7 minutes, 34 seconds

055 TMD How to Calculate the Day of the Week of Any Date

Learn how to use the connection between modular arithmetic and remainders in division to calculate the day of the week of any date.

3/18/2011 • 7 minutes, 39 seconds

054 TMD How is Modular Arithmetic Related to Remainders in Division?

Learn more about performing modular arithmetic, how it's related to finding remainders in division, and how it can help you predict the future.

3/11/2011 • 7 minutes, 40 seconds

053 TMD What is Modular Arithmetic?

Learn what modular arithmetic is, how to perform modular arithmetic, and how modular arithmetic is used in the real world.

3/4/2011 • 7 minutes, 28 seconds

052 TMD How to Convert Repeating Decimals to Fractions, Part 3

Learn the final trick that will enable you to convert any type of repeating decimal into a fraction.

2/25/2011 • 8 minutes, 24 seconds

051 TMD How to Convert Repeating Decimals to Fractions, Part 2

Learn how to convert more complicated repeating decimals from decimal to fractional form.

2/18/2011 • 7 minutes, 46 seconds

050 TMD How to Convert Repeating Decimals to Fractions, Part 1

Learn what repeating decimal numbers are and how to convert simple repeating decimals from decimal to fractional form.

2/11/2011 • 6 minutes, 39 seconds

049 TMD How to Convert Decimals to Fractions, Part 1

Learn what terminating and repeating decimals are and how to convert these rational numbers from decimal to fractional form.

2/4/2011 • 6 minutes, 50 seconds

048 TMD What are Irrational Numbers?

Learn what irrational numbers are, where they fall along the number line, and how they relate to the rest of the world of numbers. Questions go to [email protected] or 206-339-6279. Like what you hear? Help us out by writing a review at iTunes!

1/28/2011 • 7 minutes, 27 seconds

047 TMD What are Rational Numbers?

Learn what rational numbers are, where they are located on the number line, and how they relate to the rest of the world of numbers.

1/14/2011 • 5 minutes, 23 seconds

046 TMD How to Explain Patterns with Math

Learn how math can help you explain the origin of seemingly inexplicable numerical patterns.

12/31/2010 • 6 minutes, 51 seconds

045 TMD Two Tips for Multiplying by Eleven

Learn two tips that will make multiplying any number by eleven easy to do in your head.

12/17/2010 • 6 minutes, 50 seconds

006 TMD The Commutative Property of Addition in Life and Math (repeat of 2-19-10)

Not all math questions are as difficult as they seem. Learn to take advantage of the commutative property of addition to simplify problem solving. Questions go to [email protected] or 206-339-6279. Like what you hear? Help us out by writing a review at iTunes!

12/3/2010 • 7 minutes, 25 seconds

043 TMD What is the Distributive Property?

Learn what the distributive property is, how to picture it, and what it means to say that multiplication is distributive over addition.

11/26/2010 • 6 minutes, 52 seconds

042 TMD How Statistics Solved the German Tank Problem

Learn what the German tank problem is and how statistical estimators helped solve it and win World War II.

11/19/2010 • 7 minutes, 19 seconds

041 TMD What are Statistics and Estimators?

Learn what statistics and estimators are in preparation for understanding how they helped solve the "German tank problem" in World War II.

11/12/2010 • 6 minutes, 28 seconds

040 TMD How to Divide Fractions

Learn what it really means to divide two fractions and a trick you can use to make dividing fractions easier.

11/5/2010 • 6 minutes, 41 seconds

010 TMD What are Fractions?

Learn what fractions are and how they're related to integers. Questions go to [email protected] or 206-339-6279. Like what you hear? Help us out by writing a review at iTunes!

10/29/2010 • 5 minutes, 55 seconds

039 TMD What Do Prefixes Mean in Math? - Part 2

Learn what math prefixes like "kilo," "mega," "giga," and "tera" mean, where they come from, and whether or not more prefixes will be added in the future. Questions go to [email protected] or 206-339-6279. Like what you hear? Help us out by writing a review at iTunes!

10/22/2010 • 6 minutes, 49 seconds

038 TMD What Do Prefixes Mean in Math? - Part 1

Learn what math prefixes like "milli," "kilo," "mega," and "giga" mean, where they come from, and whether or not more prefixes will be added in the future. Questions go to [email protected] or 206-339-6279. Like what you hear? Help us out by writing a review at iTunes!

10/8/2010 • 6 minutes, 8 seconds

037 TMD How to Estimate How Fast Someone is Running

Learn how math can help you estimate how fast your favorite football player is running and convert this speed into units you're familiar with. Questions go to [email protected] or 206-339-6279. Like what you hear? Help us out by writing a review at iTunes!

10/1/2010 • 6 minutes, 3 seconds

036 TMD How to Convert from Miles to Kilometers...and More

Learn how to use the multiplicative identity to help you convert units from miles to kilometers, kilometers to light-years, and more. Questions go to [email protected] or 206-339-6279. Like what you hear? Help us out by writing a review at iTunes!

9/24/2010 • 5 minutes, 56 seconds

035 TMD How to Convert Units Using the Multiplicative Identity

Learn what the multiplicative identity is and how the multiplicative identity is used to convert from one unit of measurement to another. Questions go to [email protected] or 206-339-6279. Like what you hear? Help us out by writing a review at iTunes!

9/17/2010 • 4 minutes, 55 seconds

034 TMD How to Multiply Fractions

Learn what it really means to multiply two fractions and how to efficiently perform the multiplication of fractions. Questions go to [email protected] or 206-339-6279. Like what you hear? Help us out by writing a review at iTunes!

9/10/2010 • 5 minutes, 55 seconds

031 TMD What Are Area and Volume?

Learn what area and volume are, how the area and volume are related, and how to calculate the area of a square and the volume of a cube. Questions go to [email protected] or 206-339-6279. Like what you hear? Help us out by writing a review at iTunes!

8/20/2010 • 6 minutes, 40 seconds

029 TMD What are 1D, 2D, and 3D Coordinates?

Learn what 1D, 2D, and 3D (one, two, and three-dimensional) means in math and how coordinate systems are used to describe locations in 1D, 2D, and 3D. Questions go to [email protected] or 206-339-6279. Like what you hear? Help us out by writing a review at iTunes!

8/6/2010 • 5 minutes, 59 seconds

027 TMD How to Make Box and Whisker Plots

Learn what box and whisker plots are, how to make them, and how they can help you interpret data. Questions go to [email protected] or 206-339-6279. Like what you hear? Help us out by writing a review at iTunes!

7/16/2010 • 7 minutes, 20 seconds

026 TMD What are the Range and Standard Deviation?

Learn what the range and standard deviation are, how to calculate them, and why their values are important for interpreting averages. Questions go to [email protected] or 206-339-6279. Like what you hear? Help us out by writing a review at iTunes!

7/9/2010 • 7 minutes, 22 seconds

025 TMD What is the Mode?

Learn about a third method for calculating average values, the mode, and find out exactly when and why it is useful. Questions go to [email protected] or 206-339-6279. Like what you hear? Help us out by writing a review at iTunes!

7/2/2010 • 6 minutes, 30 seconds

024 TMD How Median Averaging Can Fix Your Photos

Learn how median averaging can fix your photos by making pesky tourists disappear and leaving you with a clear view of your subject. Questions go to [email protected] or 206-339-6279. Like what you hear? Help us out by writing a review at iTunes!

6/25/2010 • 6 minutes, 54 seconds

023 TMD How to Calculate Median Values

Learn how bags of potato chips show that the median value of a sample is often a better measure of its average than the more common mean. Questions go to [email protected] or 206-339-6279. Like what you hear? Help us out by writing a review at iTunes!

6/18/2010 • 5 minutes, 52 seconds

022 TMD How to Calculate Mean Values

Learn why there are multiple definitions of "average," and how to calculate one such average value: the arithmetic mean. Questions go to [email protected] or 206-339-6279. Like what you hear? Help us out by writing a review at iTunes!

6/11/2010 • 4 minutes, 49 seconds

021 TMD What Do Averages Mean?

Learn what a batting average in baseball means, how it's calculated, and why the statistical concept of an average value is so important. Questions go to [email protected] or 206-339-6279. Like what you hear? Help us out by writing a review at iTunes!

6/4/2010 • 5 minutes, 40 seconds

020 TMD How are Fractions and Division Related?

Learn about the relationship between decimal numbers, fractions, and the process of division. Questions go to [email protected] or 206-339-6279. Like what you hear? Help us out by writing a review at iTunes!

5/28/2010 • 5 minutes, 57 seconds

019 TMD What are Decimals?

Learn what decimal points and decimal numbers are and how they're related to fractions. Questions go to [email protected] or 206-339-6279. Like what you hear? Help us out by writing a review at iTunes!

5/21/2010 • 6 minutes, 12 seconds

018 TMD How to Use the Golden Ratio to Take Better Pictures

Learn where the golden ratio appears in nature, how it's related to the "rule of thirds" in photography, and why it will help you take better pictures. Questions go to [email protected] or 206-339-6279. Like what you hear? Help us out by writing a review at iTunes!

5/14/2010 • 5 minutes, 39 seconds

017 TMD What is the Golden Ratio and How is it Related to the Fibonacci Sequence?

Learn what the golden ratio is, its relationship to the Fibonacci sequence, and how artists and architects have used it throughout history. Questions go to [email protected] or 206-339-6279. Like what you hear? Help us out by writing a review at iTunes!

5/7/2010 • 5 minutes, 50 seconds

016 TMD What is the Fibonacci Sequence and Why is it Famous?

Learn what the Fibonacci sequence is, its relationship to population growth, and how it can make you the life of the party. Questions go to [email protected] or 206-339-6279. Like what you hear? Help us out by writing a review at iTunes!

4/30/2010 • 8 minutes, 38 seconds

015 TMD What Are Geometric Sequences?

Learn what a geometric sequence is and how it can be used to model everything from the balance of your bank account to the growth of populations.

4/22/2010 • 6 minutes, 56 seconds

014 TMD What Are Sequences in Math?

Learn what a mathematical sequence is and how it can help you check your arithmetic.

4/15/2010 • 7 minutes, 2 seconds

013 How to Use Percentages to Easily Calculate Sales Prices

How to Use Percentages to Easily Calculate Sales Prices

4/9/2010 • 5 minutes, 57 seconds

009 TMD How to Add Quickly, Part 2

Learn one more quick and dirty tip to help you kick your calculator dependency and make even faster calculations in your head.

3/10/2010 • 5 minutes, 47 seconds

005 TMD How to Subtract Negative Integers

Learn a quick tip for using the number line to subtract negative integers.

2/13/2010 • 7 minutes, 26 seconds

004 TMD How to Add Negative Integers

Learn a quick tip for using the number line and putting down your calculator.

2/6/2010 • 6 minutes, 32 seconds

002 TMD What are Natural Numbers?

Learn what natural numbers are and why they matter.

1/26/2010 • 9 minutes, 33 seconds

003 TMD What are Negative Numbers and Integers?

Find out all about negative numbers and integers and how they can help you solve math problems.

1/26/2010 • 9 minutes, 49 seconds

001 TMD How to Understand the Language of Math

Do you speak math? You probably understand more math than you realize.