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# How do I calculate percentages?

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Calculating percentages is a key concept in mathematics. Percentage calculations are important in all forms of mathematics including algebra, geometry and calculus. They're also utilized in many sciences such as chemistry, physics and biology.

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Determine which numbers are your part and your whole. Your whole number is the number that equals 100 percent. The part is the number that you're trying to find how many percents of the whole number it takes up.

2. ### Divide the part into the whole

Divide the part number variable into the whole number variable to obtain a decimal.

3. ### Multiply by 100

Multiply your decimal by 100 to convert the decimal into a percentage. Add a percent sign.

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## Related Questions

• A:

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.

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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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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.