Correction :

5 + 10 = 15	63 : 9 = 7
26 - 14 = 12	0 + 16 = 16
23 - 0 = 23	24 + 19 = 43
27 - 9 = 18	18 + 13 = 31
37 - 14 = 23	6 + 12 = 18
31 - 23 = 8	3 + 1 = 4
24 - 23 = 1	0 + 7 = 7
17 - 1 = 16	24 + 18 = 42
6 + 21 = 27	17 - 14 = 3
19 - 18 = 1	1 + 14 = 15