Correction :

9 - 1 = 8	33 - 15 = 18
16 + 4 = 20	43 - 23 = 20
18 + 16 = 34	30 - 22 = 8
6 : 6 = 1	28 - 5 = 23
23 - 22 = 1	3 × 5 = 15
21 + 13 = 34	28 - 18 = 10
13 - 9 = 4	33 : 11 = 3
12 - 10 = 2	22 - 20 = 2
28 - 20 = 8	2 + 1 = 3
14 + 3 = 17	38 - 16 = 22