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Q:

# What is 20 percent of a 100?

A:

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

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The product of 25 percent of 100 is 25. The best way to calculate percentages is to use what mathematicians call a proportion, which states that two ratios are equal to each other. All percentages can be converted into ratios using fractions in the following way: x % = x/100.

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Percent elongation quantifies the ability of an element or compound to stretch up to its breaking point. It is measured by dividing the change in length (up to the breaking point) by the original length, then multiplying by 100. Materials with a higher percentage elongation can stretch more before breaking.

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A \$35 item that is marked 40 percent off has a final cost of \$21. The markdown is calculated on its own before it is subtracted from the original price to determine the final total.