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## How To Calculate Cube Roots In Your Head

4m 37s 5,402,528 View Here's how you do cube roots in your head! Avoid looking like Education Secretary Nicky Morgan who was stumped when asked to do a cube root: ...## Multiply Numbers And Algebra Equations By Drawing Lines

4m 48s 1,989,277 View Some people say this is "how the Japanese multiply." Others say this is "Vedic Math." I'm not sure of the origin, but this is a visual way to multiply two numbers ...## GENIUS TRICK - Convert Decimal Numbers To Binary (Base 2)

2m 51s 269,789 View This video gives a method to convert decimal numbers to binary numbers quickly. This is a variation of the remainder system that is typically taught in courses.## Multiply Numbers By Drawing Lines

3m 176,183 View This is the higher quality version of how to multiply numbers by drawing lines. Get the Multiply By Lines Book! http://amzn.to/XRm7M4 If you like my videos, you ...## Can You Solve This Crazy Equation? Ramanujan's Radical Brain Teaser

2m 57s 607,593 View In 1911, Srinivasa Ramanujan posed this problem involving an infinite nested radical (a never-ending expression that has square roots inside of square roots).## The Quadratic Formula - Why Do We Complete The Square? INTUITIVE PROOF

9m 50s 321,740 View The quadratic formula is really useful, but its derivation is confusing to many. Like what is the point of "completing the square" anyway? In this video, I show how ...## The Prisoner's Dilemma Explained in 2 Minutes

2m 66,597 View The Prisoner's Dilemma is the most famous problem in game theory. Here I give a quick introduction to the problem. If you like my videos, you can support me at ...## The 80-20 Rule Explained (Pareto Principle)

2m 50s 90,970 View The 80/20 rule or Pareto principle comes up a lot in economics and business. But why does this pattern emerge? I show why using a paper clip experiment.## When is n² + 45 a perfect square? Can You Solve It?

2m 37s 113,731 View When is n² + 45 equal to a perfect square, for n a positive integer? I received this MathCounts problem by email from Bill by email. Can you figure it out?## Can You Solve This Infinite Fraction?

1m 30s 143,043 View What is the value of x= 1/(1 + 1/(1 + 1/(1 + ...)))? This continued infinite fraction has an interesting value! If you like my videos, you can support me at Patreon: ...## Can You Solve The Square's Length Puzzle? "Outside The Box" Thinking!

4m 29s 402,368 View In a square, a line is drawn from the bottom left corner with length 12 to the interior of the square. From the end of that line, a perpendicular is drawn going up ...## Amazing Math Trick Schools Don't Teach - Egyptians/Russian Peasant Method

3m 24s 51,734 View You can multiply two numbers if you know how to double, halve, and add up numbers. This is really interesting: basically the Egyptians were using binary ...## How Crossed Ladders And Working Together Problems Are Related - The Harmonic Mean

4m 18s 116,814 View Problem 1: Two ladders are criss-crossed against walls of height 3 and 5. At what height do they intersect? Problem 2: I take 3 hours to complete a job, and you ...## Can You Find The Easy Answer? Learn The Brilliant Trick!

4m 3s 48,495 View Thanks to Ben Craft for sending me this problem and its solution! Find a value of x such that (3 + 4)(3^2 + 4^2)(3^4 + 4^4)(3^8 + 4^8)(3^16 + 4^16)(3^32 + 4^32) ...## Can You Solve Google's Car Probability Interview Question?

3m 13s 331,058 View Google asked this problem as an interview question. If the probability of seeing a car on the highway in 30 minutes is 0.95, what is the probability of seeing a car ...## The 3 Jug Riddle

3m 10s 130,694 View You have a full 12 liter jug and empty 5 and 8 liter jugs. Can you measure exactly 6 liters? This problem dates to 1484 and was posed in the context of a milkman ...## What's The Best Soup Can Size? Solved With Calculus!

3m 54s 53,161 View A cylindrical can with volume V can be made in different ways. The cylinder can be wide and short (large radius and small height), or it can be narrower and ...## What's The Fewest Wins Needed To Make The NBA Playoffs?

3m 29s 30,409 View Every year some NBA team seems to make the playoffs with a losing or barely even record. This video considers how extreme the example can go. WATCH how ...## What is 97 x 96 = ? LEARN THE EASY WAY. Solve In 5 Seconds.

2m 17,973 View Can you solve 97 x 96 in your head? Learn the trick in this video! This is how NFL player Ryan Fitzpatrick's son was able to multiply two numbers in the 90s ...## The Prisoners Dilemma - The Most Famous Problem in Game Theory

5m 31s 206,157 View The Prisoner's Dilemma is the most famous problem in game theory, as it shows that individuals who make rational decisions might end up in an outcome that's ...