Percentages are easy to work out as long as you know the basic formula - X/Y^100. So for example if you wanted to know the percent 82 out of 386 is you would do 82/386 = 0.212 x 100 = 21.2%. It's pretty easy to memorize but hard to do without a calculator!

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In mathematics, a percentage is a number or ratio expressed as a fraction of 100. It is often denoted using the percent sign, %, or the abbreviation pct.
For example,...