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Mental Addition and Subtraction
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Estimating Sums and Differences
2 and 3 Digit Addition
2 and 3 Digit Subtraction
100

16 + 8 =

24

100

25, 30, 35, 40, ___

45

100
67 + 13 =
70 + 10 = 80
100
46 + 39 =
85
100
86 - 29
57
200

39 - 11 =

28

200

33, 39, 45, 51, ___

57

200
69 - 23 =
70 - 20 = 50
200
79 + 85 =
164
200
93 - 29
64
300

42 - 3 =

39

300

64, 56, 48, 40, ___

32

300
84 - 36 =
80 - 40 = 40
300
741 + 199
940
300
586 - 297 =
289
400

27 - 9 =

18

400
120, 230, 340, 450, ___

560

400
45 + 51 =
50 + 50 = 100
400
239 + 569 =
808
400
784 - 348 =
436
500

36 + 47 =

83

500

650, 625, 600, 675, ___

650

500
94 - 78 =
90 - 80 = 10
500
497 + 396
893
500
232 - 188
44