Math

# Amazing Math Trick Schools Don’t Teach – Egyptians/Russian Peasant Method

You can multiply two numbers if you know how to double, halve, and add up numbers. This is really interesting: basically the Egyptians were using binary multiplication! Watch the video to see how it works.

READ why this method works: http://mindyourdecisions.com/blog/2014/08/27/the-egyptian-method-russian-peasant-multiplication-video-and-a-proof/#.U_5I5vldV8E

WATCH how ancient Egyptians divided numbers: https://www.youtube.com/watch?v=bKqQGISplMo

This method is documented in the Rind Mathematical Papyrus. The document is from ~1650 BC, which is more than 3,600 years ago.

Rind Mathematical Papyrus: http://en.wikipedia.org/wiki/Rhind_Mathematical_Papyrus

Here’s a book with more info about non-western mathematical history, “The Mathematics of Egypt, Mesopotamia, China, India, and Islam: A Sourcebook” : http://amzn.to/1CuroWL

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