CHAPTER 1 LESSON
7
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"EVALUATING
ADDITIONAL AND SUBTRACTION EXPRESSIONS"
A. In the expression 17
+ m, the letter
m is a variable.
To evaluate the expression when m = 15, substitute 15 for
m.
17 + m
17 + 15 Substitute
15 for m
32 ADD.
B. Evaluate t -
14 when t is
35.
To evaluate the expression when t = 35,
substitute 35 for t.
t - 14
35 - 14 Substitute 35 for t
21 Subtract.
NOW YOU TRY J
Be careful that you read the directions for each set of
problems.
Evaluate 17 + m
when
1. m =
8 2. m =
9 3. m =
13 4. m = 25
Evaluate t -
14 when
5. t =
76 6. t =
55 7. t =
32 8. t = 81
Evaluate a +
23 when
9. a =
16 10. a =
47 11. a =
79 12. a =
68
Evaluate 75 - b
when
13. b =
8 14. b =
20 15. b =
56 16. b =
39
Evaluate x = 7
17. x +
12 18. x +
7 19. x -
7 20. 54 +
x
Evaluate each expression when
n = 20
21. n +
79 22. 94 +
n 23. 47 - n 24. 82 -
n
Evaluate each expression when
r = 32
and b = 129
25. r -
17 26. r +
89 27. 84 -
r 28. 16 +
r
29. r -
32 30. 250 -
b
CHECK
ANSWERS