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## Main Question or Discussion Point

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.

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:

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: