Page 329 - Basic College Mathematics with Early Integers

Vocabulary and Readiness Check

Use the choices below to fill in each blank.

circumference left sum zeros
decimal places right product factor

1. When multiplying decimals, the number of decimal places in the product is equal to the of the
number of decimal places in the factors.
2. In 8.6 * 5 = 43 , the number 43 is called the .
3. The distance around a circle is called its .
4. In 8.6 * 5 = 43 , the numbers 8.6 and 5 are each called a .
5. When multiplying a decimal number by powers of 10 such as 10, 100, 1000, and so on, we move the decimal
point in the number to the the same number of places as there are
in the power of 10.
6. When multiplying a decimal number by powers of 10 such as 0.1, 0.01, and so on, we move the decimal point in the
number to the the same number of places as there are in the power of 10.

Do not multiply. Just give the number of decimal places in the product. See the Concept Check in this section.
7. 0.46 8. 57.9 9. 0.0073 10. 0.428 11. 5.1296 12. 0.028
* 0.81 * 0.36 * 21 * 0.2 * 7.3987 * 1.36

4.3 Exercise Set FOR EXTRA HELP

Objectives Mixed Practice Multiply. See Examples 1 through 4. For those exercises marked, also estimate to
see if the answer is reasonable.

1. 0.26 * 5 2. 0.19 * 6 3. 1.2 4. 6.8
* 0.5 * 0.3

5. (-2.3)(7.65) 6. (4.7)(-9.02) 7. (-5.73)(-9.6) 8. (-7.84)(-3.5)

9. 6.8 * 4.2 10. 8.3 * 2.7 11. 0.347 12. 0.864
Exact: Exact: * 0.3 * 0.4
Estimate: Estimate:

13. 1.0047 14. 2.0005 15. 490.2 16. 300.9
* 8.2 * 5.5 * 0.023 * 0.032
Exact: Estimate: Exact: Estimate:

Copyright 2012 Pearson Education, Inc.
Objective Multiply. See Examples 5 through 10.

17. 6.5 * 10 18. 7.2 * 100 19. 8.3 * 0.1 20. 23.4 * 0.1

21. (-7.093)(1000) 22. (-1.123)(1000) 23. 0.7 * 100 24. 0.5 * 100

25. (-9.83)(-0.01) 26. (-4.72)(-0.01) 27. 25.23 * 0.001 28. 36.41 * 0.001
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