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Mental Math | Multiply 2 digit numbers quickly | Square Root in 3 seconds - Crazy Math Trick | Math Olympiad | Harvard University ...

00:00 The Percentage Flip 01:11 Doubling and Halving 02:17 Subtraction by Addition 03:20 Squaring Any Number Ending in 5 ...

The weird math behind mental multiplication isn't just fast—it's almost unfair. These ancient calculation tricks reveal how pattern ...

(rated 4.3/5 stars on 12 reviews) http://amzn.to/1LOCI4U "The Best Mental Math Tricks" teaches how you can look like a math ...

This math youtube video tutorial explains how to use a few simple mental math tricks as it relates to basic arithmetic concepts such ...