Correction :

10 + 9 = 19	3 - 1 = 2
39 - 19 = 20	11 - 5 = 6
23 + 17 = 40	0 + 12 = 12
14 + 8 = 22	12 + 15 = 27
31 - 22 = 9	40 - 20 = 20
9 × 9 = 81	14 + 0 = 14
5 + 18 = 23	26 - 2 = 24
24 + 6 = 30	13 + 8 = 21
32 - 14 = 18	30 - 6 = 24
15 + 6 = 21	11 - 3 = 8