Correction :

49 : 7 = 7	9 + 6 = 15
27 - 19 = 8	39 - 23 = 16
21 + 0 = 21	45 - 21 = 24
13 - 11 = 2	18 + 22 = 40
35 : 5 = 7	14 - 7 = 7
23 + 15 = 38	23 - 6 = 17
24 - 8 = 16	11 + 16 = 27
4 - 2 = 2	39 - 24 = 15
8 + 14 = 22	18 - 16 = 2
15 + 8 = 23	8 × 11 = 88