Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall. Chapter 6 Percents

Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall. 6.1 Introduction to Percent

33 Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall. Understanding Percent Percent Percent means per one hundred. The % symbol is used to denote percent. If 48 of 100 squares are shaded, 48% is shaded.

44 Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall. Example There are 100 parrots and 58 are female. What percent of the parrots are female?

55 Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall. Writing Percents as Decimals Writing a Percent as a Decimal Replace the percent symbol with its decimal equivalent, 0.01; then multiply. 43% = 43(0.01) = 0.43

66 Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall. Examples Write the percent as a decimal. a.49%49% = 49(0.01) = 0.49 b.3.8% 3.8 (0.01) = c.185% 185(0.01) = 1.85 d. 0.69% 0.69(0.01) =

77 Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall. Percents as Fractions Writing a Percent as a Fraction Replace the percent symbol with its fraction equivalent, then multiply. Don’t forget to simplify the fraction if possible.

88 Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall. Example Write each percent as a fraction or a mixed number in simplest form. a.60% b.1.4%

99 Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall. Writing Decimals as Percents Writing a Decimal as a Percent Multiply by 1 in the form of 100% = 0.27(100%) = 27%

10 Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall. Examples Write each decimal as a percent. a (100%) = 26% b (100%) = 146% c (100%) = 9% d (100%) = 70% e (100%) = 6.1%

11 Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall. Fractions as Percents Writing a Fraction as a Percent Multiplying by 1 in the form of 100%

12 Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall. Examples Write each fraction or a mixed number as a percent. a. b.

13 Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall. Summary

14 Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall. Example Complete the table. PercentDecimalFraction 0.5

15 Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall. Example 67% of American men are happy with their current weight. Convert this percent to a decimal. (Source: Gallup for Wheat Foods Council). Write this percent as a decimal and fraction. As a decimal: As a fraction:

16 Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall. Example An advertisement for a stereo system reads “1/5 off”. What percent off is this? Thus, “1/5 off” is the same as “20% off”.