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7 (8) 9 12 (8) 4 9 (x) 31 7 + 9 = 16 : 2 = 8 12 + 4 = 16 : 2 = 8 8 + 31 = 40 : 2 = 20 4 6 9 3 7 8 12 42 x 4x3 = 12 6x7 = 42 9x8 = 72 2 3 4 10 3 2 3 9 5 1 9 x 2 + 3 + 4 = 9 + 1 = 10 3 + 2 + 3 = 8 + 1 = 9 5 + 1 + 7 = 13 + 1 = 14.

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3

7 (8) 9

12 (8) 4

9 (x) 31

7 + 9 = 16 : 2 = 8

12 + 4 = 16 : 2 = 8

8 + 31 = 40 : 2 = 20

4 6 9

3 7 8

12 42 x

4x3 = 12

6x7 = 42

9x8 = 72

2 3 4 10

3 2 3 9

5 1 9 x

2 + 3 + 4 = 9 + 1 = 10

3 + 2 + 3 = 8 + 1 = 9

5 + 1 + 7 = 13 + 1 = 14.