Page 43 - บทที่ 1

17 - 8 = 7 - 1 = 5 + 7

9x2 = 4x6 = 5x9

8 - 3 = 9 + 2 = 10-4

4 + 9 = 7x8 = 2 + 2

5x3 = 13 - 5 = 4x9

16 - 7 = 1 + 5 = 8 + 5

5x6 = 3x9 = 8x9

4 + 8 = 8 + 4 = 7-2

11 - 6 = 12 - 7 = 8 + 9

4 - 3 = 2x9 = 6x8

8x4 = 12 - 4 = 8-2

1 + 7 = 5 + 3 = 3x8

6 + 4 = 3 + 7 = 2 + 4

7x1 = 8x2 = 11-9

6 + 2 = 8x8 = 7 + 7

13 - 7 = 15 - 7 = 4x8

6
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