Page 86 - บทที่ 1
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2 + 6 = 10-2
3-3 = 11 - 5 = 5 + 3
3 + 1 = 6 + 7 = 3x3
9x7 = 9x9 = 9 + 4
8 + 2 = 3 - 1 = 5-4
4x7 = 8x7 = 6x9
8-7 = 9 + 0 = 1 - 0
7 + 4 = 9x3 = 5 + 4
13-7 = 4x3 = 14-7
2 + 3 = 9 - 3 = 3x6
8x6 = 4 + 9 = 7 + 6
17-9 = 2x8 = 12-3
7 + 7 = 14 - 8 = 16-9
5x7 = 3x4 = 2x7
7 - 1 = 14 - 6 = 6 + 8
11-8 = 2x6 = 13-6
1x6 = 9 + 8 = 7 + 3
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