Correction :

21 + 9 = 30	11 × 11 = 121
6 + 18 = 24	22 + 1 = 23
32 : 4 = 8	33 - 10 = 23
29 - 17 = 12	11 + 15 = 26
1 + 21 = 22	11 + 1 = 12
14 - 5 = 9	70 : 7 = 10
8 + 6 = 14	5 : 5 = 1
14 + 8 = 22	28 - 16 = 12
9 : 9 = 1	11 - 9 = 2
21 + 16 = 37	7 × 6 = 42