Finding a percentage of a number.

What is 66% of 21?

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...ke 66%... you need to remember that 66% is the same as 66/100 = 0.66. So to get 66% of 21:

0.66 * 21 = 13.86.

If you don't need to be so exact (for example, if you need to do a quick estimation in your head, just to get an idea of about how big of a number you're talking about), you ...