Correction :

10 + 6 = 16	16 - 1 = 15
11 - 7 = 4	88 : 11 = 8
17 + 3 = 20	14 - 8 = 6
38 - 23 = 15	18 + 16 = 34
28 - 4 = 24	18 + 13 = 31
15 - 15 = 0	7 + 23 = 30
30 : 3 = 10	21 + 15 = 36
27 - 21 = 6	16 + 8 = 24
1 - 0 = 1	8 - 0 = 8
25 : 5 = 5	38 - 24 = 14