homework_remembering_te_grade_4-1zwawpi

1-8
Name
Date
Write a number sentence that shows an estimate of each
answer. Then write the exact answer. Estimates may vary.
1. 69 + 25
2. 259 + 43
3. 2,009 + 995
4. 5
3
7
+ 4
19
estimate: 70 + 25 = 95; exact: 94
estimate: 260 + 40 = 300; exact: 302
estimate: 2,000 + 1,000 = 3,000; exact: 3,004
5. 38
54
+ 52
144
6. 28
44
32
+ 46
150
7. 243
625
+ 387
1,255
8. 154
131
204
+ 179
668
Solve.
Estimates may vary.
Show your work.
9. Paul’s stamp collection includes 192 domestic and
811 foreign stamps.
About how many domestic and foreign stamps does
Paul have altogether?
200 + 800; about 1,000 stamps
© Houghton Mifflin Harcourt Publishing Company
Exactly how many domestic and foreign stamps
does Paul have altogether?
1,003 stamps
10. Plane A travels 102,495 miles. Plane B travels 91,378 miles.
How many miles in all do the two planes travel?
193,873 miles
Explain how you can use estimation to check that your
answer is reasonable.
Possible explanation: I would round 102,495 down to 100,000, and
round 91,378 down to 90,000. 100,000 + 90,000 = 190,000. Since
193,873 is close to 190,000, the answer is reasonable.
UNIT 1 LESSON 8 Estimation and Mental Math 15