Correction :

17 + 20 = 37	9 + 7 = 16
42 - 24 = 18	10 - 2 = 8
19 + 24 = 43	14 - 12 = 2
29 - 18 = 11	9 - 0 = 9
42 : 6 = 7	14 - 13 = 1
25 - 14 = 11	10 + 0 = 10
2 + 16 = 18	38 - 23 = 15
21 : 7 = 3	14 : 7 = 2
20 + 22 = 42	36 - 17 = 19
32 - 17 = 15	4 × 11 = 44