Correction :

38 - 23 = 15	22 - 19 = 3
8 - 8 = 0	14 + 2 = 16
20 + 23 = 43	22 + 19 = 41
4 - 1 = 3	44 : 4 = 11
18 : 6 = 3	23 + 10 = 33
20 + 23 = 43	12 - 6 = 6
32 - 9 = 23	7 + 20 = 27
16 - 13 = 3	32 - 22 = 10
29 - 20 = 9	25 - 23 = 2
4 + 22 = 26	11 + 21 = 32