15-8*3 = (24-6) / 2 = 12/6*9 = 7*10-8 = 87-38 = 18+26 = 73+17 = 93-40=

1) 15 - 8 * 3 = 15 - 24 = - 9;

2) (24 - 6) : 2 = 18 : 2 = 9;

3) 12 : 6 * 9 = 12 * 9 = 18;

4) 7 * 10 - 8 = 70 - 8 = 62;

5) 87 - 38 = (87 - 37) - 1 = 50 - 1 = 49;

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37 1

6) 18 + 26 = (18 + 2) + 24 = 20 + 24 = 44;

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2 24

7) 73 + 17 = (73 + 7) + 10 = 80 + 10 = 90;

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7 10

8) 93 - 40 = 3 + (90 - 40) = 3 + 50 = 53.

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3 90