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Published on 10 May 2014 | over 4 years ago

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 and it does work. The video also shows how to use the same method to multiply algebraic expressions like (x + 2)(x + 3).

Here's a blog post I wrote on this: mindyourdecisions.com/blog/2012/01/27/multiplicating-with-lines-math-trick-how-it-works/

Many people asked me to write a reference guide. So I wrote a book "Multiply Numbers By Drawing Lines." www.amazon.com/gp/product/1500866148/

I've made a few follow-up videos you might like.

Multiply by lines (advanced examples)

Multiply by lines (why it works)

Multiply by lines (the rotation trick)

If you like my videos, you can support me at Patreon: www.patreon.com/mindyourdecisions

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My Books

"The Joy of Game Theory" shows how you can use math to out-think your competition. (rated 4/5 stars on 23 reviews) www.amazon.com/gp/product/1500497444

"The Irrationality Illusion: How To Make Smart Decisions And Overcome Bias" is a handbook that explains the many ways we are biased about decision-making and offers techniques to make smart decisions. (rated 5/5 stars on 1 review) www.amazon.com/gp/product/1523231467/

"Math Puzzles Volume 1" features classic brain teasers and riddles with complete solutions for problems in counting, geometry, probability, and game theory. Volume 1 is rated 4.5/5 stars on 11 reviews. www.amazon.com/gp/product/1517421624/

"Math Puzzles Volume 2" is a sequel book with more great problems. www.amazon.com/gp/product/1517531624/

"Math Puzzles Volume 3" is the third in the series. www.amazon.com/gp/product/1517596351/

"40 Paradoxes in Logic, Probability, and Game Theory" contains thought-provoking and counter-intuitive results. (rated 4.9/5 stars on 7 reviews) www.amazon.com/gp/product/1517319307/

"The Best Mental Math Tricks" teaches how you can look like a math genius by solving problems in your head (rated 4.7/5 stars on 3 reviews) www.amazon.com/gp/product/150779651X/

"Multiply Numbers By Drawing Lines" This book is a reference guide for my video that has over 1 million views on a geometric method to multiply numbers. (rated 5/5 stars on 1 review) www.amazon.com/gp/product/1500866148/
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