Magic Math

Apr 27, 2009 at 10:48 PM
I love these videos.

1 Responses to Magic Math

  1. Cool videos. I wonder if you've heard of The Trachtenberg Speed System of Basic Mathematics, a system developed by engineer Jakow Trachtenberg to keep himself sane when he was imprisoned in nazi concentration camps for many years. After his wife helped him escape, he taught it in Switzerland. It is similarly amazing.