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.
Know MoreDetermine 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.
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.
The multiplication of percentages is accomplished by converting the percentage to decimals, and multiplying the decimals. To convert a percentage to a decimal, the percent sign must be removed, and the number divided by 100. The decimal point should always be moved two places to the left when dividing by 100. After dividing 75 by 100, the answer is 0.75.
Full Answer >Percent means “for every 100” or “out of 100.” If 80 percent of the population owns a computer, this implies that 80 out of every 100 people have one. The symbol “%” means percent. Writing a percentage therefore means representing the number out of 100. For instance, finding what percent of 20 is 40: (40/20) * 100 = 200%
Full Answer >No one person invented percentages. The concept developed throughout history. In Ancient Rome mathematical computation were expressed in fractions of 100. This concept later evolved into percentages.
Full Answer >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.
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