Correction :

10 - 2 = 8	29 - 15 = 14
18 + 9 = 27	22 - 16 = 6
18 - 6 = 12	20 : 5 = 4
9 + 12 = 21	19 + 23 = 42
35 - 21 = 14	7 × 8 = 56
1 × 6 = 6	2 + 6 = 8
15 + 6 = 21	11 × 2 = 22
20 + 3 = 23	8 × 7 = 56
25 - 20 = 5	40 : 8 = 5
19 + 6 = 25	4 - 4 = 0