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Divide and Conquer
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Divide and Conquer

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12 episodes in this series

Episode 1 Math in Your Head!
Dive right into the joys of mental math. First, learn the fundamental strategies of mental arithmetic (including the value of adding from left to right, unlike what you do on…
Episode 2 Mental Addition and Subtraction
Professor Benjamin demonstrates how easily you can mentally add and subtract one-, two-, and three-digit numbers. He also shows you shortcuts using the complement of a number (its distance from…
Episode 3 Go Forth and Multiply
Delve into the secrets of easy mental multiplication: Professor Benjamin's favorite mathematical operation. Once you've mastered how to quickly multiply any two-digit or three-digit number by a one-digit number, you've…
Episode 4 Divide and Conquer
Turn now to the last fundamental operation of arithmetic: division. Explore a variety of shortcuts for dividing by one- and two-digit numbers; learn how to convert fractions such as 1/7…
Episode 5 The Art of Guesstimation
In most real-world situations: such as figuring out sales tax or how much to tip: you don't need an exact answer but just a reasonable approximation. Here, develop skills for…
Episode 6 Mental Math and Paper
Sometimes we encounter math problems on paper in our daily lives. Even so, there are some rarely taught techniques to help speed up your calculations and check your answers when…
Episode 7 Intermediate Multiplication
Take mental multiplication to an even higher level. Professor Benjamin shows you five methods for accurately multiplying any two-digit numbers. Among these: the squaring method (when both numbers are equal),…
Episode 8 The Speed of Vedic Division
Vedic mathematics, which has been around for centuries, is extremely helpful for solving division problems: much more efficiently than the methods you learned in school. Learn how Vedic division works…
Episode 9 Memorizing Numbers
Think that memorizing long numbers sounds impossible? Think again. Investigate a fun: and effective: way to memorize numbers using a phonetic code in which every digit is given a consonant…
Episode 10 Calendar Calculating
The fun continues in this episode with determining the day of the week of any date in the past or in the future. What day of the week was July…
Episode 11 Advanced Multiplication
Professor Benjamin shows you how to do enormous multiplication problems in your head, such as squaring three-digit and four-digit numbers; cubing two-digit numbers, and multiplying two-digit and three-digit numbers. While…
Episode 12 Masters of Mental Math
Professor Benjamin concludes his exciting course by showing how you can use different methods to solve the same problem; how you can find the cube root of large perfect cubes;…

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Comments (2)

Anonymous picture

I do not understand his method of teaching for mental math. He goes through all these steps for the simple math and I am thinking does he expect people to do all these steps in their heads. I would have thought there would be a much faster way then what he is suggesting. I am coming up ...Read more

Anonymous picture

I like it