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Three Addends
Estimate Addends
Mental Math
Regrouping
100

65 + 4 + 28

97

100

31 + 25

30 + 30 = about 60

100

Add 3 to each of the following:

24, 34, 44, 54, 64

27, 37, 47, 57, 67

100

14 + 17

31

200

12 + 12 + 7

31

200

36 + 56

40 + 60 = about 100

200

Add 1 to each of the following

10, 20, 30, 40, 50

11, 21, 31, 41, 51

200

25 + 25

50

300

40 + 7 + 16

63

300

8 + 89

10 + 90 = about 100

300

Add 4 to each of the following:

3, 13, 23, 33, 43

7, 17, 27, 37, 47

300

37 + 19

56

400

8 + 8 + 10

26

400

27 + 41

30 + 40 = about 70

400

Add 10 to each of the following:

45, 50, 55, 60, 65

55, 60, 65, 70, 75

400

46 + 28

74

500

52 + 21 + 10

83

500

12 + 76 

10 + 80 = about 90

500

Take away 2 from each of the following

18, 28, 38, 48, 58

16, 26, 36, 46, 56

500

85 + 16

101