1. Copyright © 2008 Pearson Addison-Wesley. All rights reserved. Chapter 3 Decimals

2. 3-4-2 Copyright © 2008 Pearson Addison-Wesley. All rights reserved. Section 3.4 Dividing Decimals

3. 3-4-3 Copyright © 2008 Pearson Addison-Wesley. All rights reserved. Divide a Decimal by a Whole Number

4. 3-4-4 Copyright © 2008 Pearson Addison-Wesley. All rights reserved. Example Divide. a. b. 124.18 ÷ 4 c.0.24 ÷ 3

5. 3-4-5 Copyright © 2008 Pearson Addison-Wesley. All rights reserved. Solution Strategy a. b. c.

6. 3-4-6 Copyright © 2008 Pearson Addison-Wesley. All rights reserved. Divide a Decimal by a Power of 10 Dividing a Decimal by a Power of 10 such as 10, 100, 1000... Move the decimal point in the dividend to the left the same number of places as there are zeros in the power of 10. Insert zeros, as necessary.

7. 3-4-7 Copyright © 2008 Pearson Addison-Wesley. All rights reserved. Divide a Decimal by a Power of 10 Dividing a Decimal by a Power of 10 such as 0.1, 0.01, 0.001... Move the decimal point in the dividend to the right the same number of places as there are place values in the decimal power of 10. Insert zeros as necessary.

8. 3-4-8 Copyright © 2008 Pearson Addison-Wesley. All rights reserved. Example d. 13,000 ÷ 0.001 Divide. b. 58.73 ÷ 1000 c. a.

9. 3-4-9 Copyright © 2008 Pearson Addison-Wesley. All rights reserved. Solution Strategy = 0.15306 = 0.05873 = 372.4 = 13,000,000 d. 13,000 ÷ 0.001 Divide. b. 58.73 ÷ 1000 c. a.

10. 3-4-10 Copyright © 2008 Pearson Addison-Wesley. All rights reserved. Divide a Decimal or a Whole Number by a Decimal

11. 3-4-11 Copyright © 2008 Pearson Addison-Wesley. All rights reserved. Example Divide. b. c. a. Round to the nearest tenth.

12. 3-4-12 Copyright © 2008 Pearson Addison-Wesley. All rights reserved. Solution Strategy Divide. a. b. 5.4c.

13. 3-4-13 Copyright © 2008 Pearson Addison-Wesley. All rights reserved. Estimate When Dividing Decimals Steps for Estimating Dividing Decimals Step 1.Round each number to the specified place. Step 2.Divide the rounded dividend by the rounded divisor.

14. 3-4-14 Copyright © 2008 Pearson Addison-Wesley. All rights reserved. Example Divide 86.7 ÷ 8.5 Then estimate the quotient by rounding the dividend and divisor to one nonzero digit.

15. 3-4-15 Copyright © 2008 Pearson Addison-Wesley. All rights reserved. Solution Strategy Then estimate the quotient by rounding the dividend and divisor to one nonzero digit. Divide 86.7 ÷ 8.5 86.7 ÷ 8.5 100 ÷ 10

16. 3-4-16 Copyright © 2008 Pearson Addison-Wesley. All rights reserved. Calculating an Average

17. 3-4-17 Copyright © 2008 Pearson Addison-Wesley. All rights reserved. Example Apply your knowledge You are a clerk at The Time and Again boutique. This morning you made sales of $213.37, $143.77, and $89.62. What is the average of your morning sales?

18. 3-4-18 Copyright © 2008 Pearson Addison-Wesley. All rights reserved. Solution Strategy = $148.92 You are a clerk at The Time and Again boutique. This morning you made sales of $213.37, $143.77, and $89.62. What is the average of your morning sales?