Unit 5 Decimal Ops 2.1 ACE
Name _________________
Applications:
For Exercises 1–4, find the sum of each pair of cards without using a
calculator. Show your work and explain how an estimation strategy
suggests that your answer is probably correct.
1.
2.
3.
4.
5. During the Memorial High School highway clean-up project,
Ms. Palkowski cleaned 0.125 of a mile for the teachers’ team and
then 0.4 of a mile for the science club. How much did she clean
altogether?
6. Multiple Choice Which is the correct decimal sum?
A.
B.
81.9
 0.62
88.1
81.9
 0.62
82.5.2
C.
D.
81.9
 0.62
0.1439
81.9
 0.62
8.81
7. Find each sum.
a. 4.9  3
3
4
b. 91.678 + 2.34 + 12.001
c. 2.75  3 2
5
8. Place decimal points in 102 and 19 so that the sum of the two
numbers is 1.21.
9. Place decimal points in 34, 4, and 417 so that the sum of the three
numbers is 7.97.
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Connections:
For Exercises 21–26, perform each calculation.
21. 5(10 + 7)
22.
43 • 2
23.
24
6
25.
33
26. 2(10 – 8) + 8
24.
10 (42)
For Exercises 27–30, write the calculation needed to answer the given
question and explain how you know you’ve chosen the right operation.
27. A world-class athlete ran 200 meters in 19.19 seconds. Suppose that
he ran the first half of that race (around a curve) in 10.75 seconds.
How long did it take him to run the second half of the race (on a
straightaway)?
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