Correction :

4 + 8 = 12	24 - 17 = 7
24 - 0 = 24	14 - 8 = 6
25 - 3 = 22	19 - 16 = 3
22 + 9 = 31	41 - 23 = 18
27 - 17 = 10	19 + 7 = 26
29 - 17 = 12	22 - 7 = 15
39 - 19 = 20	18 : 2 = 9
12 + 24 = 36	0 - 0 = 0
26 - 23 = 3	12 + 16 = 28
22 - 5 = 17	0 + 15 = 15