Correction :

23 - 12 = 11	10 × 6 = 60
12 + 9 = 21	29 - 5 = 24
25 - 23 = 2	32 - 8 = 24
1 × 11 = 11	34 - 18 = 16
38 - 15 = 23	24 + 14 = 38
7 + 14 = 21	31 - 10 = 21
12 - 1 = 11	7 × 7 = 49
19 + 16 = 35	35 - 14 = 21
21 + 14 = 35	22 - 7 = 15
39 - 21 = 18	8 + 7 = 15