0.42
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Expressed as a decimal, 42/100 is equal to 0.42.
42/100 = 0.42
The easiest way to find a percent is to turn the percentage into a decimal. You do this by placing the percentage over 100. 42% is the same as 42/100, which equals .42 in decimal notation. Now, take the decimal notation and multiply it by your number, in this case 125. .42 * 125 = 52.5
21 over 50
You change it into a fraction form ( 42 over 100) and reduce.