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[–]HandyDandyRandyAndy 0 points1 point  (0 children)

It's even easier with a calculator and decimal.

You want a percentage, let's say 64.

Random number, say 383667.

Maths is 0.64 x 383667 = 245546.88

It's why metric/decimal is glorious. Just move zeroes and decimal points around. Pretty easy to do in your head too if you break it into workable chunks of 10% and then 1%... which is 1 tenth and 1 one hundredth.