Mental Math Multiplication By 101: Solve In 1-3 Seconds

  • 8 years ago
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Even if you are very slow and think you can’t do math in your head, you can solve this multiplication problem and other similar to it in your head in 3 seconds or less after watching the video or doing just one example. This video will show you exactly how to multiply any two-digit whole numbers by 101 mentally. It is so easy to learn and perform, it must be a trick right? Not really. Many mental math techniques share the core principles as standard math but in a different twist allowing for many computations to be performed mentally with ease.

This is a very specific mental math technique. The value 101 is important in other mental math techniques including finding the sum of squares, thus, it is introduced in this video. Multiplying by 101 can be extended to multiplying larger numbers just as easy but with slight modifications.

101 = 100 + 1

The expression “49 X 101” is the same as the following two:
(49 X 100) + (49 X 1).

But why even use the two expressions right above computations whenever there is a two-digit number multiplied by 101-the answer is 4949.

For example, multiplying a three-digit numbers such as 123 by 101 is 12423-it can be done in seconds as well.

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