Correction :

2 × 8 = 16	37 - 19 = 18
31 - 22 = 9	12 + 5 = 17
14 - 14 = 0	7 + 10 = 17
41 - 24 = 17	14 + 6 = 20
35 - 11 = 24	5 + 5 = 10
20 + 7 = 27	15 - 11 = 4
13 + 15 = 28	3 + 8 = 11
0 + 4 = 4	27 : 3 = 9
20 : 2 = 10	29 - 10 = 19
2 : 1 = 2	2 × 1 = 2