CHAPTER 7
Practice 7-1
Practice 7-2
525
Add or subtract. Write each answer in simplest
form.
1a.^59 ^49 b.^78 ^58 c. ^1116 156
2a.^78 ^34 b.^13 ^56 c. 190 ^12
3a.( 134 134 ) ^67 b. 172 ^14
Estimate the sum or difference.
4a.^57 190 b. 196 ^17 c. ^1112 ^59
5a. 9 ^23 3 ^18 b. 7 ^15 7 ^56 c. 19 ^19 9 ^78
6a. 12 ^15 7 ^23 b. 41 ^12 19 ^57 c. 10 ^13 3 ^34
Compute. Use the addition properties.
7a. 1 ^23 (^16 ^16 ) b. 3 ^12 5 2 ^14
8a. 190 (^15 ^25 ) b. 2 ^14 2 ^13 ^14
0 9. How much is ^16 increased by ^14 ?
10.Find the sum of ^17 , 241 , and ^23 .
11.Anita is a runner on the school track team.
12.Upon reaching the ^78 -mi marker of the 1^12 -mi
12.track, how much farther must she run to get to
the end of the track?
12.The sum of nand 1^34 is 4. Find the value of n.
13.Ethan spent 1^78 h working on a model airplane.
12.Then he spent 2^16 h raking leaves. About how
12.much time did Ethan spend on those two
activities?
14.From the sum of 170 and ^35 , subtract ^23 .
Add or subtract. Write each answer in simplest
form.
1a. 2 ^23 b. 6 ^58 c. 12 ^16
1a. 3 ^15 b. 3 ^12 c. 08 ^45
2a. 3 ^34 b. 9 ^13 c. 11
1a. 1 ^12 b. 6 ^12 c. 08 ^37
3a. 7 ^47 b. 4 c. 8 ^13
1a. 5 ^56 b. 2 ^23 c. 5 ^34
Evaluate each expression.
4a.ab 4 ^12 ^11 , when a 3 ^17 and b 5 ^23
4b.x y, when x16 and y 3 ^56
Solve and check.
5a.c^23 ^1112 b.t 2 ^13 5 ^13
6a.q^35 115 b.m 3 ^25 7
0 7. Add 2^56 to the difference between 5 and 2 172 .
0 8. A team practiced 2^12 h before lunch and
12.then 1^34 h after lunch. What is the total time
it practiced?
0 9. A recipe calls for 3^13 c of white flour, 1^14 c
12.of whole wheat flour, and ^12 c of rice flour.
12.Find the total amount of flour in the recipe.
10.Jeannette has three jump ropes: 6^12 ft, 9^23 ft,
12.and 7^18 ft. Estimate the total length.
11.On Monday, a certain stock opened at
- 67 ^18 points. By Friday its value was 80
12.points. Find its increase in value.
12.Ted weighed 145^12 lb. After 2 months of
12.dieting, he weighed 136^13 lb. How much
weight did he lose?
13.Mary needs 6^25 yd of ribbon. She has 4^34 yd.
How much more ribbon does she need?
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