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Add + 10
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Challenge!
100

4+3

7

100

4-0

4

100

21+10

31

100

33-10

23

100

28+12

40

200

9+3

12

200

9-7

2

200

34+10

44

200

18-10

8

200

51+8

59

300

7+8

15

300

9-6

3

300

76+10

86

300

17-10

7

300

62+7

69

400

4+9

13

400

5-4

1

400

62+10

72

400

19-10

9
400

120+10

130

500

8+9

17

500

11-8

3

500

99+10

109

500

56-10

46

500

210+10

220