Correction :

9 + 2 = 11	33 - 11 = 22
17 - 9 = 8	22 + 16 = 38
29 - 16 = 13	2 × 7 = 14
16 + 9 = 25	5 + 13 = 18
40 - 23 = 17	20 + 11 = 31
21 - 6 = 15	4 + 21 = 25
8 - 3 = 5	25 - 19 = 6
18 - 0 = 18	20 + 7 = 27
16 + 10 = 26	5 + 24 = 29
21 + 22 = 43	17 + 7 = 24