I once saw a programme not so long ago, showing a young man who was calculating something like 56^6 in a matter of seconds.(adsbygoogle = window.adsbygoogle || []).push({});

And also working out square roots of numbers in seconds all entirely in the head.

Could someone tell me how calculations like that can be performed so quickly ?

(I would have trouble doing square roots on paper let alone in the head :tongue2:

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# Mental arithmetic

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