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# How do you work out percentages without a calculator?

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A calculator is always helpful when determining percentages, but you can easily compute percentages without a calculator. A pencil and paper might be helpful as you do this.

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1. ### Make the percentage a fraction

Determine what the percentage you are trying to find would be. For example, if you wanted to calculate 33 percent of a number, you would use the fraction 1/3.

2. ### Divide the number you are trying to find the percentage of by the denominator

Take the number you want to find the percentage of (for this example, assume it is 21) and divide it by the denominator, which is the bottom number of the fraction.

Divide 21 by 3 and you find that the answer is 7. This model works any time you want to find the percentage of a number.

Take the answer that you calculated and multiply it by the denominator. The answer you receive should be the number for which you were originally trying to find the percentage. In this example, multiplying the denominator of 3 by the answer you calculated, which was 7 verifies that the answer is correct because the result is the original number of 21.

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## Related Questions

• A:

A decimal number can be transformed into a percentage by multiplying it by 100. If the number is a fraction, it is first necessary to convert it into a decimal by dividing the numerator by the denominator.

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• A:

Converting the percentages to decimals then finding the average of these figures and reconverting back to a percentage is the easiest way to do this. You need the percentages you wish to average, paper, a pencil and a calculator.

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To subtract a percentage, one starts by converting the percentage into its decimal equivalent and subtracting the result from one. Multiplying the answer by the original figure gives the value after subtracting the percentage. For instance, to subtract a tax of 27 percent from base pay, one coverts the percentage to 0.27 or (27/100). Basic pay x (1 - 0.27) gives the pay after the tax deduction.