Show:
Easy Addition
Hard Addition
Subtraction
Medium Subtraction
Hard Subtraction
100

7 + 4 

11

100

67 + 4

71

100

10 - 3

7

100

17 - 7

10

100

98 - 4

94

200

3 + 12

15

200

98 + 2

100

200

7 - 2

5

200

14 - 2

12

200

65 - 2

63

300
14 + 2

16

300

70 + 5

75

300

8 - 4

4

300

15 - 3

12

300

34 - 3

31

400

8 + 3

11

400

32 + 7

39

400

2 - 1

1

400

19 - 5

14

400

79 - 7

72

500

89 + 1

90

500

500 + 23

523

500

3 - 2

1

500

23 - 4

19

500

80 - 40

40