two 2 digit addition
2 digit subtraction

three 2 digit addition
four 2 digit addition
100

23 + 12

35

100

34 - 12

22

100

12 + 15 + 20

47

100

11 + 12 + 13 + 14

50

200

47 + 25 

72

200

50 - 23

27

200

24 + 13 + 11

48

200

22 + 15 + 24 + 19

80

300

58 + 36 

94

300

72 - 45

27

300

35 + 22 + 18

75

300

31 + 27 + 18 + 24

100

400

69 + 17

86

400

61 - 29

32

400

46 + 27 + 19

92

400

45 + 36 + 29 + 20

130

500

84 + 29

113

500

90 - 58

32

500

58 + 34 + 29

121

500

57 + 28 + 34 + 16

135

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