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WorksheetsEstimating & either adding / subtracting two 2-digit numbers
Total questions: 22
Worksheet time: 11mins
Estimate the sum of 45 and 22.
40 + 20 = 60
50 + 20 = 70
45 + 25 = 80
45 + 22 = 67
Estimate the difference of 45 and 22.
50 - 20 = 30
40 - 20 = 20
45 - 25 = 20
45 - 22 = 23
Estimate the sum of 99 and 47.
99 + 47 = 146
100 + 50 = 150
100 + 45 = 145
90 + 40 = 130
Estimate the difference of 99 and 47.
99 - 47 = 52
100 - 50 = 50
90 - 40 = 50
100 - 40 = 60
Estimate the sum of 60 and 25.
60 + 25 = 85
60 + 20 = 80
60 + 30 = 90
Estimate the difference of 60 and 25.
60 - 25 = 35
60 - 30 = 30
60 - 20 = 40
Estimate the sum of 7 and 3.
7 + 3 = 10
10 + 0 = 10
0 + 0 = 0
10 + 5 = 15
Estimate the sum of 17 and 27.
17 + 27 = 44
20 + 30 = 50
15 + 30 = 45
10 + 30 = 40
Estimate the difference of 27 and 17.
27 - 17 = 10
30 - 20 = 10
25 - 15 = 10
20 - 10 = 10
Estimate the difference of 82 and 67.
82 - 67 = 15
80 - 70 = 10
80 - 60 = 20
80 - 65 = 15
Estimate the sum of 82 and 67.
82 + 67 = 149
80 + 70 = 150
80 + 60 = 140
80 + 65 = 145
Estimate the sum of 25 and 75.
25 + 75 = 100
30 + 80 = 110
20 + 70 = 90
20 + 80 = 100
Estimate the difference of 75 and 25.
75 - 25 = 50
70 - 30 = 40
70 - 20 = 50
80 - 30 = 50
What does estimate mean?
round to the nearest friendly / landmark number
add
subtract
What does difference mean?
round to the nearest friendly / landmark number
add
subtract
What does sum mean?
round to the nearest friendly / landmark number
add
subtract
Estimate the sum represented on this number line. Type just the estimate (not the number sentence) for your response.
(a)
Mrs. Robinson estimated the sum of 82 and 4 to be 86. Is she correct? If she is wrong, which is the correct estimate?
She is right, 86 is correct
She is wrong, 80 is correct
She is wrong, 90 is correct
Mrs. Hasher estimated the sum of 34 and 57 to be 80. Is she correct? If she is wrong, which is the correct estimate?
80 is correct, she is right
She is wrong, 70 is correct
She is wrong, 90 is correct
She is wrong, 91 is correct
Use your slate or thinking paper. What difference and number sentence is represented on this number line?
88-36=52
88-52=36
52-36=88
52-88=36
Mrs. Dasen estimated the difference of 32 and 27 to be 0. Is she correct? If she is wrong, what is the right estimate?
she is correct, 0 is right
she is wrong, 10 is correct
she is wrong, 5 is correct
she is wrong, 59 is correct
Mrs. Jimerson estimated the difference of 75 and 22 to be 50. Is she correct? If she is wrong, which is the correct estimate?
she is correct, 50 is right
she is wrong, 60 is right
she is wrong, 53 is right
she is wrong, 100 is right
