Name
*
In 1 through 6, estimate each sum
or difference.
1.
563 S
+ 375 S
□00
□00
2.
288 S
- 171 S
□□0
□□0
3. 645 + 253
4. 262 - 132
5. 952 - 402
6. 3,098 + 1,021
You can round to the nearest 10,
nearest 100, or nearest 1,000 to
estimate using mental math.
7. Explain To which place would you
round to estimate 6,904 - 4,111?
Explain.
8. The Statue of Liberty was completed
in 1886. The Empire State Building
was completed in 1931. About
how many years after the Statue
of Liberty was the Empire State
Building completed?
Leveled Practice In 9 through 23, estimate
each sum or difference.
9.
12.
542 S
+ 27 S
□□0
□0
368
+ 137
10.
13.
281 S
- 172 S
918
- 391
□00
□00
14.
11.
5,323 S
+ 2,611 S
15.
5,317
+ 1,734
□,000
□,000
778
+ 95
16. 738 + 57
17. 895 - 305
18. 6,755 - 1,844
19. 586 + 278
20. 423 + 196
21. 891 + 223
22. 1,724 - 731
23. 7,451 - 3,195
*For another example, see Set B on page 151.
Topic 2 Lesson 2-2
97
Grade
DATA
24. Estimation The table shows the number
of students per grade. Estimate the total
number of students in Grades 4 and 5.
Explain how you made your estimate.
Number of Students
3
145
4
152
5
144
6
149
25. Math and Science Gravity is a force.
Earth’s gravity pulls objects toward
the center of Earth. Scientists have
calculated an equation they use to
measure the force of gravity. One of
the numbers in the equation is 6.67.
Which digit is in the hundredths
place in 6.67?
26. Theo was born in the year 2004. One
of his older sisters was born in 1992.
Rounding to the nearest ten, about how
many years younger is Theo?
27. This year, 35,658 people ran in a
marathon. Last year, 8,683 fewer people
ran in the marathon. About how many
people ran in the marathon last year?
28. Number Sense During swimming
practice, Juan swam 15.2 laps and Ted
swam 15.7 laps. Who swam more laps?
29. Estimation The class sold 86 tickets
to a school talent show on Wednesday,
34 tickets on Thursday, and 103 tickets
on Friday. About how many tickets to
the talent show did the class sell?
30. Extend Your Thinking Suppose you
want to estimate the sum of 234 and
563. Will rounding each number to the
nearest hundred be closer to the actual
sum than rounding each number to the
nearest ten? Explain.
A
B
C
D
98
About 100 tickets
About 200 tickets
About 300 tickets
About 400 tickets
© Pearson Education, Inc. 4