Somewhere around middle school, you learned about squaring numbers and the inverse, finding the square root of a number, but a little reminder can't hurt. You square a number when you multiply it by ...
Guinness World Records on MSN
Fastest time to mentally calculate the square root of ten 8-digit numbers - 1 minute 11.22 seconds by Aaryan Shukla
Aaryan Shukla is known as the human calculator for his ability to calculate large sums in his head.
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