244 Chapter 7
Lessons 1–11
Estimate the sum or difference. (See pp. 224–225.)
- ^59 ^37 2. ^1145 ^78 3. 9 ^16 7 ^12 4. 12 190 11 ^67
Add or subtract. Estimate to help. (See pp. 226–233.)
- ^12 6. 4 ^18 7. ^13 8. 4 ^57 9. 5 10. 10
^13 6 ^38 ^14 1 ^27 1 ^12 02 ^34
- 14 1
3
0 ^1
1
3 12.^1
3
8 ^19
2
3 13.^10 ^1 1
1
0 14.^4
3
7 ^1
1
6
- 4
1
4 ^1
1
2 ^2
3
8 16.
1
8 ^3
2
3 ^3
7
8 17.^15
3
8 ^9
7
8
Compute. Use mental math and the properties of addition. (See pp. 222–223, 234–235.)
1
4
1
4 19.^5
1
6 (3
1
2 ^3
1
2 ) 20.^7
1
4 ^3
1
2
Evaluate each expression for the given values. (See pp. 236–237.)
- 7
3
8
n, when n 3 ^1
8
22. r 5 ^1
3
2 ^3
5
, when r 1 ^2
5
- 7
3
4
c 1 ^1
4
d, when c 3 ^2
6
and d 2 ^3
8
Solve and check. (See pp. 238–239.)
- a
1
6
+ ^5
6
7 ^1
3
25. 3 ^3
7
y 8 ^2
3
26. w 8 ^3
4
9
1
7
2
- A stock rose 3^14 points on Tuesday.
It fell 1^34 points on Wednesday. On
Thursday the stock rose 4^18 points.
By Friday the stock was worth 28^12
points. How much was the stock
worth on Monday?
28. A veterinarian recommended that Troy
put his cat on a diet. The first week
the cat lost 1
3
4
lb. The second week
she gained
1
2
lb. The third and fourth
weeks she lost 2
3
4
lb each. If the cat’s
weight after four weeks was 12 lb,
how much did the cat weigh before
the diet began?
(See pp. 240–243.)
(See Still More Practice,p. 525.)
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