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# How do I find a percentage of a number?

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To determine the percentage of a number, divide the fraction of the amount by the whole amount, and multiply the result by 100. As AAA Math explains, to calculate what percentage 68 is of 87, divide 68 by 87; This equals approximately 0.7816. Multiply this answer by 100. The final answer is 78.16 percent.

## Keep Learning

Dictionary.com defines a percent as one-hundredth of a part. A percentage is how many hundredths of a part a given value is. When dividing the fraction of an amount by the whole amount, the answer results in a decimal. The first column to the right of the decimal is the tenths value, and the column to the right of that is the hundredths value.

Since the answer to the question of percentage has the value of hundredths, multiplying by 100 brings hundredths into the ones column. For example, to determine the percentage value of 25 out of 100, first divide 25 by 100, resulting in 0.25. Multiply by 100 to find the percentage, which in this case is 25 percent. Since the whole value being worked with is 100, the fraction amount is the same as the percentage. Using the same method, to determine the percentage of 1/4, divide 1 by 4, then multiply by 100 for an answer of 25 percent.

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## Related Questions

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Reverse percentage can be calculated by dividing a known amount by 1 minus the discount rate or 1 plus the tax rate. Such calculations are helpful in determining the original price of a sale item purchased or the pretax price of a transaction already done.

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A whole number and a mixed number are simplified by first expressing the sum as a fraction with the same denominator as the proper fraction portion of the mixed number, and then simplifying that fraction if possible. The resulting number is an improper fraction. To convert the improper fraction to a ratio such as x:y, write the numerator of the fraction before the colon, with the denominator after.

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To turn a fraction into a mixed number, you must divide the fraction's numerator by its denominator. Use the number of times the denominator goes into the numerator to represent the whole number, and then use the remaining number to represent the new numerator.