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Chapter 4. Percentages

• 4.1 Definitions

• 4.2 Figuring Out the Percents of Numbers

• 4.3 Adding, Subtracting, Multiplying, and Dividing Percents

• 4.4 Percent Increase and Decrease (Percent Change)

• 4.5 Simple and Compound Interest

Definitions

• Percent is defined as a rate or proportion per hundred, one one-hundredth, or 1/100.

• The symbol for a percent is %.

• A percent is a form of a fraction with its denominator equal to 100. To remember that per cent is per one-hundred, think of a cent ury, which has 100 years.

• A percent can be converted to a fraction or decimal. A percent can be reduced and manipulated like a fraction or decimal.

• For example, seventy-five percent = 75% = 75/100 = 0.75.

Examples: Common percents are:

 1/4 = 0.25 = 25% 1/2 = 0.50 = 50% 3/4 = 0.75 ...

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