Correction :

23 + 4 = 27	15 + 17 = 32
7 + 16 = 23	32 - 15 = 17
17 - 3 = 14	1 × 2 = 2
20 + 2 = 22	7 + 8 = 15
42 - 21 = 21	8 - 0 = 8
3 + 10 = 13	3 + 15 = 18
9 × 10 = 90	33 - 14 = 19
14 + 4 = 18	37 - 16 = 21
7 × 3 = 21	0 + 12 = 12
6 × 11 = 66	4 + 14 = 18