Correction :

6 × 9 = 54	35 - 17 = 18
3 + 20 = 23	2 + 2 = 4
19 + 23 = 42	11 - 1 = 10
21 + 6 = 27	8 × 2 = 16
5 × 9 = 45	15 + 3 = 18
10 + 11 = 21	37 - 16 = 21
32 - 16 = 16	20 - 7 = 13
24 - 6 = 18	10 + 7 = 17
11 - 9 = 2	24 + 22 = 46
21 - 9 = 12	24 + 14 = 38