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.
Check out my book “The Best Mental Math Tricks” (rated 4.7/5 stars on 4 reviews)
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)
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
This trick is really old–here’s a newspaper article from 1913 that explains the trick!
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