Correction :

11 - 6 = 5	12 + 13 = 25
23 - 16 = 7	8 + 0 = 8
9 - 8 = 1	37 - 21 = 16
18 + 10 = 28	40 - 24 = 16
24 - 7 = 17	6 : 1 = 6
16 + 6 = 22	4 + 2 = 6
5 + 18 = 23	24 : 8 = 3
14 + 18 = 32	14 - 12 = 2
29 - 16 = 13	10 × 4 = 40
26 - 21 = 5	30 - 16 = 14