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Rounding
Mental Math Addition
Mental Math Subtraction
Estimating in Addition
Estimating in Subtraction
100
What is 89 to the nearest ten?
90
100
Make a ten to add 38+26
64
100
26-18
12
100
Round to the nearest ten to estimate 28+46
80
100
Round to the nearest ten to estimate 321-112
210
200
What is 767 to the nearest hundred?
800
200
Use breaking apart to add 25+12
37
200
67-28
39
200
Round to the nearest ten to estimate 75+17
100
200
Round to the nearest ten to estimate 255-89
170
300
What is 956 to the nearest ten?
960
300
Use breaking apart to add 72+18
90
300
83-39
44
300
Round to the nearest hundred to estimate 114+58
200
300
Round to the nearest hundred to estimate 579-214
400
400
What is 349 to the nearest ten?
350
400
Use breaking apart to add 34+25
59
400
57-18
39
400
Round to the nearest hundred to estimate 198+426
600
400
Round to the nearest hundred to estimate 216-97
100
500
What is 9,999 to the nearest ten?
10,000
500
33+23
56
500
31-14
17
500
Use compatible numbers to estimate 654+253
900
500
Use compatible numbers to estimate the difference of 328-207
125