Correction :

34 - 14 = 20	0 + 22 = 22
36 - 15 = 21	2 + 17 = 19
29 - 6 = 23	27 - 19 = 8
20 + 1 = 21	11 + 0 = 11
6 × 9 = 54	35 - 21 = 14
31 - 16 = 15	1 + 18 = 19
3 + 11 = 14	7 × 11 = 77
36 : 9 = 4	14 - 14 = 0
25 - 16 = 9	20 + 15 = 35
20 : 4 = 5	45 : 5 = 9