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WorksheetsMentally Adding & Subtracting
Total questions: 12
Worksheet time: 15mins
Name
Class
Date
1.
Jerome goes to the store to buy groceries. He has $200 to spend. He buys $89 worth of groceries. How much money does he have left?
a)
$289
b)
$89
c)
$211
d)
$210
2.
Which state has the most land area in square miles?
a)
Alaska
b)
Texas
c)
California
d)
Montana
3.
Use mental math to compute your answer:
86 + 25
86 + 25
a)
115
b)
111
c)
125
d)
110
4.
Use mental math to compute your answer:
125 + 28
125 + 28
a)
153
b)
155
c)
143
d)
145
5.
The school collected pencils for an out reach program. One group brought in 148 pencils and the other group brought 48 pencils. How many did they bring?
a)
200
b)
186
c)
196
d)
204
6.
Using the previous question: One group brought in 148 pencils and the other group brought 48 pencils. How did you find your answer?
a)
I round 148 to 150 and rounded 48 to 50. I then added 150 and 50 to get 200. Then I subtracted 4 to get 196.
b)
I rounded 148 to 150 and 48 to 50. Then I added 150 + 50 together to get 200.
7.
Use mental math to compute your answer:
101 - 49 =
101 - 49 =
a)
52
b)
53
c)
50
d)
150
8.
How many more red and green marbles are in the collection than blue and yellow marbles?
a)
80
b)
100
c)
74
d)
200
9.
Garry's Work
422- 145- 45
422- (145- 45)
422- 100
322
Do you agree with Garry's work? Explain.
422- 145- 45
422- (145- 45)
422- 100
322
Do you agree with Garry's work? Explain.
a)
Yes, his work does seem to follow along with the correct order, and the answer is 322.
b)
No, he needs to use a different strategy. He should have 422-145= 277, and then 277- 45 to get the answer 232.
c)
No, he should have rounded 422 to 400, rounded 145 to 150, and rounded 45 to 50 to find the answer of 200
10.
Use mental math to compute your answer:
120- 33
120- 33
a)
87
b)
93
c)
97
d)
83
11.
Use mental math to compute your answer:
127 + 149
127 + 149
a)
276
b)
266
c)
267
d)
270
12.
Use mental math to compute your answer:
103- 79
103- 79
a)
25
b)
24
c)
178
d)
182
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