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Estimating Sums and Differences

Total questions: 80

Worksheet time: 3hrs 2mins

Name
Class
Date
1.
a)
500 - 200 = 300
b)
600 - 200 = 300
c)
600 - 200 = 400
d)
500 - 200 = 200
2.
a)
400 + 200 = 600
b)
500 + 200 = 600
c)
500 + 200 = 700
d)
400 + 200 = 700
3.
a)
400 + 100 = 500
b)
400 + 200 = 600
c)
400 + 200 = 500
d)
300 + 100 = 400
4.
a)
400 + 200 = 600
b)
500 + 200 = 700
c)
500 - 200 = 400
d)
500 - 200 = 300
5.
a)
300 - 100 = 400
b)
200 - 100 = 100
c)
300 - 100 = 200
d)
300 + 100 = 400
6.
a)
700 - 200 = 500
b)
800 - 200 = 600
c)
800 - 300 = 500
d)
700 - 200 = 500
7.
a)
300 - 200 = 100
b)
300 + 200 = 500
c)
400 - 200 = 200
d)
300 + 200 = 500
8.
a)
500 + 100 = 600
b)
500 - 100 = 400
c)
600 + 100 = 700
d)
600 + 200 = 800
9.
a)
900 - 300 = 600
b)
900 - 200 = 700
c)
1,000 - 200 = 800
d)
900 + 300 = 1,200
10.
a)
300 + 100 = 500
b)
300 + 100 = 400
c)
300 - 100 = 200
d)
400 + 100 = 500
11.
Estimate the sum of 37+99 by rounding to the nearest tens
a)
120
b)
150
c)
140
d)
136
12.
Estimate the sum of 52+59 by rounding to the nearest tens
a)
110
b)
100
c)
111
d)
90
13.
Estimate the sum of 120+190 by rounding to the nearest hundreds
a)
100
b)
200
c)
0
d)
300
14.
Estimate the sum of 327+431 by rounding to the nearest hundreds
a)
700
b)
600
c)
758
d)
800
15.
Estimate the difference of 470-289 by rounding to the nearest hundreds
a)
300
b)
100
c)
181
d)
200
16.
Estimate the difference of 7,900-2,999 by rounding to the nearest thousands
a)
6,000
b)
4,000
c)
5,000
d)
3,000
17.
Tracy ordered 325 pet toys and 165 bags of dog food for her new pet store. Which is the best estimate of the total number of items Tracy ordered?
a)
400
b)
500
c)
600
d)
700
18.
There was 926 people at basketball tournament. 607 people left before noon. Which is the best estimate of the number of people who stayed?
a)
150
b)
250
c)
300
d)
500
19.

Jill took 32 minutes to complete math homework and 16 minutes to complete reading. About how many minutes did Jill use for homework?

a)

48 minutes

b)

50 minutes

c)

55 minutes

d)

40 minutes

20.

Michael jogged 8 miles on Monday and Tuesday, and 12 miles on Friday. About how far did Michael jog altogether?

a)

32 miles

b)

28 miles

c)

20 miles

d)

30 miles

21.

A museum has 237 works of art on the first floor. The second floor has 349 works of art. The third floor has 219 works of art. About how many works of art in all? (Use greatest place value.)

a)

800

b)

700

c)

750

d)

660

22.

To celebrate Halloween a family is counting pumpkin seeds. Max and his dad counted 243; Brita and her mom counted 333. About how many more seeds did Brita and her mom count?

a)

85

b)

100

c)

300

d)

500

23.

491 people attended the school play.  422 people attended the football game.  Ryan rounds to the nearest hundred and estimates that 800 people attended both events.  Is his estimate correct?  Explain

a)

Yes, because 400 + 400 = 800

b)

No, because 500 + 400 = 900

c)

No, because he did not estimate correctly.

d)

Yes, because he estimated correctly. 

24.

While on a trip, Becca counted 148 red cars and 153 blue cars. Jasmine, her sister, counted 184 white cars and 92 green cars. Rounding to the tens place, who counted more cars?

a)

Becca counted more, she got 300

b)

Jasmine counted more, she got 300

c)

Becca counted more, she got 250

d)

Jasmine counted more, she got 250

25.

Which answer is reasonable for the following problem: Sally went shopping with $50. Could she buy a shirt for $17 and pants for $29?

a)

No, she doesn't have enough money.

b)

Yes, she has enough money.

26.

Estimate the sum: 43+22

a)

55

b)

60

c)

50

d)

20

27.

Estimate the sum: 62+35

a)

95

b)

90

c)

100

d)

97

28.

Amy had 13 jelly beans in her left hand and 28 in her right hand. Estimate how many jelly beans Amy had in all.

a)

45

b)

40

c)

50

d)

30

29.

Estimate the difference to

56- 41=

a)

30

b)

20

c)

25

30.

Estimate the difference to

71-37=

a)

30

b)

40

c)

35

31.

Estimate the difference to

36-11=

a)

30

b)

25

c)

20

32.

Estimate the difference to

89-31=

a)

70

b)

60

c)

50

33.
Round to the nearest ten to estimate the sum.
46 + 29
a)
80
b)
60
c)
70
d)
40
34.
Round to the nearest hundred to estimate the difference.
561 - 349
a)
200
b)
300
c)
100
d)
900
35.
Round to the nearest ten to estimate the difference.
89 - 55 = 
a)
40
b)
20
c)
150
d)
30
36.
Round to the nearest hundred to estimate the sum.
479 + 432 = 
a)
800
b)
1,000
c)
900
d)
100
37.
Round to the nearest ten to estimate the sum.
73 + 48 = 
a)
20
b)
30
c)
110
d)
120
38.
Round to the nearest ten to estimate the difference.
61 - 23 = 
a)
40
b)
80
c)
30
d)
90
39.
There are 378 lights on the tree.  124 lights burned out.  About how many lights are left?
a)
500
b)
300
c)
200
d)
400
40.
Round to the nearest hundred to estimate the difference.
871 - 327 = 
a)
600
b)
1,200
c)
500
d)
400
41.
There are 98 students riding on bus 6.  There are 76 students riding on bus 132.  About how many students ride the bus in all?
a)
170 students
b)
160 students
c)
20 students
d)
180 students
42.
Round to the nearest ten to estimate the difference.
57 - 16 = 
a)
40
b)
50
c)
70
d)
80
43.
Round to the nearest hundred to estimate the sum.
692 + 439 = 
a)
1,000
b)
1,200
c)
1,100
d)
300
44.
Round to the nearest hundred to estimate the difference.
703 - 249 = 
a)
500
b)
900
c)
400
d)
600
45.
Mrs. Habick has 449 points in a video game.  Mr. Snow has 297 points.  About how many more points does Mrs. Habick have than Mr. Snow?
a)
200 points
b)
100 points
c)
700 points
d)
600 points
46.
Round to the nearest ten to estimate the sum.
48 + 28 = 
a)
80
b)
20
c)
70
d)
30
47.
Round to the nearest hundred to estimate the difference.
631 - 123 = 
a)
600
b)
500
c)
400
d)
700
48.
Estimate the sum: 43+22
a)
55
b)
60
c)
50
d)
20
49.
Estimate the sum: 62+35
a)
95
b)
90
c)
100
d)
97
50.
Estimate the sum: 54+92
a)
146
b)
130
c)
120
d)
140
51.
Estimate the sum: 71+85
a)
160
b)
166
c)
150
d)
140
52.
Estimate the sum: 123+456
a)
579
b)
600
c)
650
d)
500
53.
Estimate the sum: 322+478
a)
700
b)
850
c)
790
d)
800
54.
Estimate the sum: 652+623
a)
1200
b)
1275
c)
1300
d)
1250
55.
Estimate the sum: 793+964
a)
1,600
b)
1,800
c)
1,700
d)
1,500
56.
Estimate the sum: 1,432+1,564
a)
2,000
b)
2,100
c)
2,996
d)
3,000
57.
Estimate the sum: 2,764+4,851
a)
7,000
b)
6,000
c)
5,000
d)
4,000
58.
Estimate the sum: 5,023+6,243
a)
12,000
b)
9,000
c)
11,000
d)
11,266
59.
Estimate the sum: 22,367+10,756
a)
32,000
b)
33,000
c)
30,000
d)
40,000
60.
Estimate the sum: Round to the nearest 10
437+37
a)
440
b)
480
c)
400
d)
460
61.
Estimate the sum: Round to the nearest hundred
567+962
a)
1,200
b)
1,400
c)
1,500
d)
1,600
62.

237 fifth graders and 346 fourth graders went on a field trip. Estimate how many more fourth graders were on a field trip than fifth graders.

a)

200 more

b)

109 more

c)

100 more

d)

110 more

63.

If you have 382, you might say you have ABOUT...

a)

400

b)

390

c)

450

d)

350

64.

Estimate the sum of 37+99 by rounding to the nearest tens

a)

120

b)

150

c)

140

d)

136

65.

Estimate the sum of 120+190 by rounding to the nearest hundreds

a)

100

b)

200

c)

0

d)

300

66.

Estimate the sum of 52+59 by rounding to the nearest tens

a)

110

b)

100

c)

111

d)

90

67.

Estimate the difference of 470-289 by rounding to the nearest hundreds

a)

300

b)

100

c)

181

d)

200

68.

Estimate the difference of 7,900-2,999 by rounding to the nearest thousands

a)

6,000

b)

4,000

c)

5,000

d)

3,000

69.

Tracy ordered 325 pet toys and 165 bags of dog food for her new pet store. Which is the best estimate of the total number of items Tracy ordered?

a)

400

b)

500

c)

600

d)

700

70.

There was 926 people at basketball tournament. 607 people left before noon. Which is the best estimate of the number of people who stayed?

a)

150

b)

250

c)

300

d)

500

71.
71 - 37 =
a)
30
b)
40
c)
35
d)
20
72.
54 + 92 =
a)
140
b)
130
c)
120
d)
140
73.
322 + 478 =
a)
800
b)
700
c)
850
d)
790
74.
35 - 25
a)
30
b)
20
c)
10
d)
40
75.
Tom grew 212 pumpkins and Oscar grew 435 pumpkins this year.  About how many pumpkins did they grow together? 
a)
600 pumpkins
b)
700 pumpkins
c)
200 pumpkins
d)
800 pumpkins
76.
What is 778 rounded to the nearest hundred? 
a)
Seven hundred- ninety 
b)
Eight hundred
c)
Nine hundred
d)
Seven hundred
77.
Kevin had 61 nickels in his bank. He spent 28 of his nickels. About how many nickels does he left in his bank? 
a)
30 nickels
b)
90 nickels
c)
80 nickels
d)
89 nickels
78.
Alexis grew 614 watermelons and Bryan grew 329 watermelons this year. About how many more watermelons did Alexis grow than Bryan? 
a)
400 watermelons
b)
500 watermelons
c)
700 watermelons
d)
300 watermelons
79.
What is 297 rounded to the nearest tens? 
a)
300
b)
200
c)
290
d)
280
80.
What is 537 rounded to the nearest ten? 
a)
540
b)
500
c)
600
d)
530

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