Correction :

17 + 6 = 23	9 - 0 = 9
11 - 7 = 4	11 × 8 = 88
1 + 12 = 13	15 + 22 = 37
24 + 15 = 39	15 + 3 = 18
9 + 20 = 29	4 × 9 = 36
15 + 2 = 17	8 + 22 = 30
14 - 5 = 9	4 : 4 = 1
22 - 11 = 11	23 - 5 = 18
22 - 9 = 13	25 - 2 = 23
23 + 7 = 30	1 + 23 = 24