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# What is 20 percent of a 100?

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Twenty percent of 100 is 20. To calculate the percentage of a number, convert the percentage to a decimal number; move the decimal point two places to the left, and multiply by the number. The word percent means per 100.

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While this example requires simple math, other problems involve more complex number manipulations. Percentages are also expressions of ratios, so 20 percent is also written as 20/100, a fraction that simplifies to 1/5.

While it is common to see the percent sign in science and math documents, writing style guides indicate using the word percent as their preference. Writing style guides also indicate that when a percent is not a whole number, the proper form is to write the number as a decimal rather than a mixed number.

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## Related Questions

• A:

The simplest method to calculate a percent change is to subtract the original number from the new number, and then divide that difference by the original number and multiply by 100 to get a percent. For example, a change from 5 to 6 has a difference of 1, divided by the original 5 is 0.2, which is a 20 percent change when multiplied by 100.

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A percentage can be solved by multiplying a given quantity by a percent. It should be noted, however, that the percent should first be divided by the numeral 100 before doing the multiplication.

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Six percent is written as "0.06" in decimal format. Percent is derived from the Latin term "per centum" that means "by the hundred." It means "one-hundredth part," or 1/100. Six percent is thus six one-hundredth parts, or 6/100.