simple addition
simple subtraction
harder addition
harder subtraction
RANDOM!
100

2+3

5

100

3-1

2

100

20+31

51

100

36-16

20

100

54-12

42

200

3+4

7

200

7-4

3

200

32+17

49

200

34-12

22

200

26+19

45

300

11+5

16

300

10-4

6

300

12+41

53

300

45-13

32

300

43-3+2

42

400

13+8

21

400

17-8

9

400

37+24

61

400

29-11

18

400

34-12+7

29

500

19+8

27

500

23-7

16

500

52+33

85

500

63-16

47

500

58+11-4

65

M
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