Correction :

22 - 5 = 17	22 - 8 = 14
34 - 21 = 13	0 + 4 = 4
18 + 12 = 30	2 + 14 = 16
20 + 10 = 30	32 - 15 = 17
19 + 20 = 39	17 + 10 = 27
21 + 10 = 31	2 + 21 = 23
17 + 7 = 24	32 - 13 = 19
19 + 24 = 43	27 - 19 = 8
1 × 10 = 10	35 - 23 = 12
14 + 23 = 37	20 - 19 = 1