Adding 1
Adding 2
Subtracting 1
Subtracting 2
100

20 + 70 =

90

100

76 + 54 =

130

100

20 - 10 =

10


100

18 - 9 =

9

200

34 + 43 =

77

200

20 + 15 =

35

200

30 - 15 =

15

200

50 - 25 =

25

300

99 + 2 =

101

300

56 + 35 =

91

300

76 - 34 =

42

300

100 - 50 =

50

400

92 + 20 =

112

400

100 + 35 =

135

400

92- 74 =

18

400

100 - 64 =

36