Correction :

13 + 17 = 30	31 - 12 = 19
11 × 1 = 11	1 + 4 = 5
19 + 1 = 20	16 : 8 = 2
41 - 17 = 24	4 + 9 = 13
6 × 8 = 48	22 - 13 = 9
0 + 14 = 14	5 + 11 = 16
16 - 5 = 11	27 - 5 = 22
12 + 17 = 29	23 + 17 = 40
24 - 11 = 13	24 + 10 = 34
18 + 0 = 18	20 + 0 = 20