Correction :

8 - 3 = 5	5 : 5 = 1
12 + 17 = 29	47 - 24 = 23
2 + 19 = 21	1 + 20 = 21
11 - 1 = 10	11 × 3 = 33
22 - 15 = 7	28 - 15 = 13
13 - 5 = 8	7 + 11 = 18
24 - 20 = 4	34 - 17 = 17
20 + 17 = 37	8 × 6 = 48
39 - 22 = 17	12 + 22 = 34
27 - 23 = 4	6 - 2 = 4