Since all percentages are out of 100, 21% is 21/100. Then, whenever you have a percentage, move the decimal two places to the left to get the decimal. So, because 21% can be written as 21. %, 0.21 is the decimal value for 21%.
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Decimal 21.0=21 percent 2100
21% = 21/100
21% written as a decimal is 0.21
250% = 21/2 or, as a decimal, 2.5
21% = 21/100 in fraction form.