Multiply Numbers By Drawing Lines

by Presh Talwalkar

In May 2014, Presh Talwalkar made a YouTube video about how to multiply numbers by drawing lines. By the end of the month, the video received over a million views. Multiplying by lines is an innovative visual method to multiply numbers. It works like magic and gets people excited about math. This book illustrates how you can multiply by lines, enumerates the precise steps in the process, and offers examples of how to use the method. There are also novel applications of how one diagram can solve additional problems and how multiplying by lines can be used for algebraic expressions. The book includes 35 exercises with solutions.

97 pages, Kindle Edition

First published August 31, 2014

Reviews

[Bart · Rating 4 out of 5]

A translation of a language, requiring as much art as math, a parlor trick for adults but an interesting way of presenting 1s, 10s and 100s to children.

[David Hyder · Rating 5 out of 5]

wow

This is a fascinating method of handling multiplication of numbers. A few simple lines and voila easier math. Where was this when I was a child.

[Carolina Liechtenstein · Rating 5 out of 5]

This book really helped me visualize equations and math problems. I also had fun with this book. This will help any predominantly right brained person grasp math. I will use the techniques in this book to help people who are visually inclined with mathematics.

[Julia · Rating 3 out of 5]

Just watch the YouTube video. It's far more entertaining, but the math trick is still fun to use.

[Stephanie · Rating 5 out of 5]

Easy multiplication

I've never been great at math. I really wish this method had been taught in school. It really would've made math more enjoyable.