Correction :

41 - 23 = 18	5 + 13 = 18
22 + 12 = 34	20 - 13 = 7
24 - 7 = 17	25 - 23 = 2
13 + 1 = 14	3 + 12 = 15
2 : 1 = 2	50 : 10 = 5
16 + 7 = 23	8 + 15 = 23
15 - 13 = 2	18 + 3 = 21
8 × 9 = 72	19 - 7 = 12
0 + 15 = 15	34 - 18 = 16
38 - 24 = 14	19 + 14 = 33