Page 251 - Basic College Mathematics with Early Integers

Vocabulary and Readiness Check

Use the choices below to fill in each blank.Any numerical answers are not listed.

expression least common denominator 7
equivalent 6

1. To add or subtract unlike fractions, we first write the fractions as fractions with
a common denominator.The common denominator we use is called the .
1 5
2. The LCD for and is .
6 8

1 5 1 # 4 5 # 3
3. + = + = + = .
6 8 6 4 8 3
1 5 1 4 5 3
4. - = # - # = - = .
6 8 6 4 8 3
5. x - y is a(n) .
10 1
6. Since -10 6-1 , we know that - - .
13 13
Write the LCD of each pair of fractions.

1 2 1 3 1 5 2 7
7. , 8. , 9. , 10. ,
2 3 2 4 6 12 5 10
4 1 23 1 11 3 2 3
11. , 12. , 13. , 14. ,
7 8 24 3 12 4 3 11

3.5 Exercise Set FOR EXTRA HELP

Objective Add or subtract as indicated. See Examples 1 through 6.

2 1 5 1 1 1 2 1
1. + 2. + 3. - 4. -
3 6 6 12 2 3 3 4

2 2 5 1 3 3 2 2
5. - + 6. - + 7. - 8. -
11 33 9 3 14 7 15 5

11 2 2 3 5 3
9. + 10. + 11. 2 - 12. 5 -
35 7 5 25 12 20
5 1 7 5 5 7
13. - 14. - 15. + 1 16. -10 +
12 9 12 18 7 10

5 4 7 2 2 1 5 1
17. + 18. + 19. - 20. -
11 9 18 9 3 6 6 12 Copyright 2012 Pearson Education, Inc.

1 1 1 1 1 1 2 2 5 1
21. + + 22. + + 23. - - 24. - -
3 9 27 4 16 64 11 33 9 3

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