Page 318 - Basic College Mathematics with Early Integers

Vocabulary and Readiness Check

Use the choices below to fill in each blank. Not all choices will be used and some may be used more than once.

minuend vertically like true horizontally
difference subtrahend last false
1. The decimal point in a whole number is positioned after the digit.
2. In 89.2 - 14.9 = 74.3 , the number 74.3 is called the , 89.2 is the , and 14.9 is the
.
3. To add or subtract decimals, we line up the decimal points .
4. True or false: If we replace x with 11.2 and y with -8.6 in the expression x - y , we have 11.2 - 8.6 .

Mentally find the sum or difference.
5. 0.3 6. 0.4 7. 1.00 8. 3.00
+ 0.2 + 0.5 + 0.26 + 0.19

9. 7.6 10. 4.5 11. 0.9 12. 0.6
+ 1.3 + 3.2 - 0.3 - 0.2

FOR EXTRA HELP
4.2 Exercise Set

Objectives Mixed Practice Add. See Examples 1 through 4, and 10. For those exercises marked, also estimate
to see if the answer is reasonable.

1. 1.3 + 2.2 2. 2.5 + 4.1 3. 5.7 + 1.13

4. 2.31 + 6.4 5. 24.6 + 2.39 + 0.0678 6. 32.4 + 1.58 + 0.0934

7. 6.014 8. 3.003 9. -2.6 + 1-5.972
9.009 8.098
+ 76.181 + 71.486

10. -18.2 + 1-10.82 11. 15.78 + 1-4.622 12. 6.91 + 1-7.032

13. 234.89 14. 734.89 15. 100.009
+ 230.67 + 640.56 6.08
Exact: Estimate: Exact: Estimate: + 9.034
Exact: Estimate:

16. 200.89 17. Find the sum of 45.023, 3.006, and 18. Find the sum of 65.0028, 5.0903,
7.49 8.403 and 6.9003
+ 62.83
Exact: Estimate:

295