Correction :

9 × 3 = 27	34 - 12 = 22
33 - 11 = 22	37 - 15 = 22
7 × 7 = 49	9 + 14 = 23
10 + 21 = 31	18 - 14 = 4
18 + 1 = 19	12 - 1 = 11
25 - 18 = 7	20 - 8 = 12
24 + 10 = 34	10 - 7 = 3
19 + 22 = 41	26 - 7 = 19
4 + 17 = 21	11 : 11 = 1
34 - 13 = 21	2 + 24 = 26