Forty percent is the same as two-fifths. When you divide the numerator, which is 2, by the denominator, which is 5, you get 0.40. You can turn decimal numbers into percentages by multiplying them by 100. This means that 0.40 is the same as 40%.
You can turn a decimal into a fraction in many different ways. Converting the fraction to a decimal first is the easiest way to do it, but you usually need a calculator. You can also multiply the fraction so that the number in the denominator equals 100. To do this, multiply the top by the same number as the bottom. When you multiply 2 over 5 by 20, you get 40 over 100 as a new fraction. Because a percentage is the part of a whole, or 100 percent, the numerator of 40 in this new fraction is the same as the fraction as a percentage.
Simple algebra is the last way to change a fraction to a percentage. Since the percentage is a part of 100, the fraction can be set to equal some number, x, over 100. In this situation, 2 times 5 is the same as x times 100. When you multiply 2 by 100, you get 200 over 5, which is 40, which is the same as the percentage x.
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