Copyright © 2011 Pearson Education, Inc. Publishing as Prentice Hall. Chapter 5 Percents

Copyright © 2011 Pearson Education, Inc. Publishing as Prentice Hall. 5.2 Introduction to Percent

Martin-Gay, Developmental Mathematics, 2e 33 Copyright © 2011 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.

Martin-Gay, Developmental Mathematics, 2e 44 Copyright © 2011 Pearson Education, Inc. Publishing as Prentice Hall. Example There are 100 parrots and 58 are female. What percent of the parrots are female?

Martin-Gay, Developmental Mathematics, 2e 55 Copyright © 2011 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

Martin-Gay, Developmental Mathematics, 2e 66 Copyright © 2011 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) =

Martin-Gay, Developmental Mathematics, 2e 77 Copyright © 2011 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%

Martin-Gay, Developmental Mathematics, 2e 88 Copyright © 2011 Pearson Education, Inc. Publishing as Prentice Hall. Examples Write the decimal as a percent. a (100%) = 26% b (100%) = 146% c (100%) = 9% d (100%) = 70% e (100%) = 6.1%