Sec 3.1 Writing Decimals and Fractions as Percents

1
Sec 3.1 Writing Decimals and Fractions as
Percents

• Objectives
• Write a percent as a decimal
• Write a percent as a fraction
• Write a fractional percent as a decimal
• Write a decimal as a percent
• Write a fraction as a percent

2

• Percents are
• hundredths, or
• parts of 100

3
Summary

• To Write a Percent as a Decimal
• Delete the percent sign
• Move the decimal point two places to the left.

4
Summary

• To Write a Percent as a Fraction
• First write the percent as a decimal
• Next, write the decimal as a fraction
• Finally, write the fraction in lowest terms.

5
Summary

• To Write a Fractional Percent as a Decimal
• Write the fraction as a decimal percent
• Convert the decimal percent to a decimal--ie.
  delete the percent sign and move the decimal
  point two places to the left.

6
Summary

• To Write a Decimal as a Percent
• Move decimal point two places to the right
• Attach percent () sign.

7
Summary

• To Write a Fraction as a Percent
• Multiply the fraction by 100 and express the
  result in lowest terms
• Attach percent () sign.

8
Solutions to Exercises

• P. 89
• 5. 2.034 203.4

9
Solutions to Exercises

• P. 89
• 14. .2108 21.08

10
Solutions to Exercises

• P. 89
• 24.

11
Homework Sec 3.1 Divisible by 3

• In other words 3, 6, 9, 12, . . . 83.