Addition
Subraction
# before
# after
100

 3 + 4 =

7

100

5 - 4 =

1

100

8

7

100

8

9

200

7 + 5 =

12

200

8 - 3 =

5

200

11

10

200

13

14

300

10 + 7 =

17

300

10 - 7 = 

3

300

35

34

300

39

40

400

10 + 45 = 

55

400

24 - 10 =

14

400

67

66

400

69

70

500

61 + 35 = 

96

500

45 - 40 =

5

500

120

119

500

112

113

M
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