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Human calculator

Soapweed

Well-known member
Can you do this?

http://static.videoegg.com/ted/flash/fullscreen.html?v=/ted/movies/ARTHURBENJAMIN-2005&cid=/ted/movies
 

Doug Thorson

Well-known member
He may be converting the numbers to Roman Numerals. I have heard that if you learn Roman numerals you can multiply any number almost instantly.
 
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