Correction :

10 × 7 = 70	38 - 22 = 16
8 + 21 = 29	9 + 15 = 24
15 + 14 = 29	16 - 12 = 4
35 - 14 = 21	8 - 6 = 2
23 + 6 = 29	38 - 23 = 15
20 - 11 = 9	5 : 1 = 5
22 - 5 = 17	17 + 13 = 30
23 - 9 = 14	19 + 3 = 22
4 + 2 = 6	1 + 17 = 18
8 + 17 = 25	11 + 15 = 26