Math

How To Calculate Cube Roots In Your Head

Here’s how you do cube roots in your head! Avoid looking like Education Secretary Nicky Morgan who was stumped when asked to do a cube root: https://www.youtube.com/watch?v=x8CV0dfQMdU

Note: the starting number needs to be a perfect cube. So it’s more of a magic trick: ask someone to cube a number and then you can deduce their original number quickly.

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Can you multiply 97 by 96 in your head? Or can you figure out the day of the week when you are given a date? This book is a collection of methods that will help you solve math problems in your head and make you look like a genius. “The Best Mental Math Tricks” (rated 4.7/5 stars on 4 reviews)
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H/T Mashable
http://mashable.com/2014/12/12/education-minister-maths-question/

Arthur Benjamin is a Professor at Harvey Mudd College and well-known for feats of mental calculation. He explains the cube root algorithm in this pdf
https://www.math.hmc.edu/~benjamin/papers/Cubing.pdf

This trick is really old–here’s a newspaper article from 1913 that explains the trick!
http://cdnc.ucr.edu/cgi-bin/cdnc?a=d&d=SFC19130615.2.162.13.11

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