Correction :

17 + 12 = 29	11 × 9 = 99
14 - 2 = 12	18 + 2 = 20
10 - 0 = 10	21 + 5 = 26
19 + 2 = 21	15 - 3 = 12
15 + 7 = 22	16 + 12 = 28
21 + 20 = 41	23 + 2 = 25
22 + 2 = 24	6 × 6 = 36
14 + 8 = 22	29 - 20 = 9
2 × 8 = 16	4 + 18 = 22
37 - 18 = 19	7 + 10 = 17