This is an easy trick but most people have a hard time explaining what is going on. In this video I will turn 13 lines into 12 lines, thereby "proving" 13 = 12. Where does the extra line go?

My blog post for this video:
https://wp.me/p6aMk-5fR

Source
Baumback, Randall R. Mathematical puzzles for the secondary mathematics teacher: a collection, classification, and evaluation. Diss. 1980. Puzzle 69. http://csueastbay-dspace.calst....ate.edu/bitstream/ha

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"The Joy of Game Theory" shows how you can use math to out-think your competition. (rated 3.9/5 stars on 32 reviews)
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"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 4 reviews)
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"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 3 reviews)
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