Now I have discovered another trick – you can rotate the diagram to solve even more multiplication problems! This is the first video to demonstrate a really amazing connection between arithmetic and geometry. I hope you find this worth sharing!
I wrote a book “Multiply Numbers By Drawing Lines” by request to answer many questions. Here is the origin of the book and details of its contents: http://mindyourdecisions.com/blog/2014/09/03/now-available-multiply-numbers-by-drawing-lines-book/
Here’s my video “Multiply Numbers By Drawing Lines” that, to my knowledge, was the first to illustrate 0-lines and algebraic expressions https://www.youtube.com/watch?v=0SZw8jpfAk0
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