Correction :

23 + 6 = 29	9 + 23 = 32
15 + 20 = 35	14 + 7 = 21
0 + 18 = 18	4 + 9 = 13
33 - 11 = 22	32 - 23 = 9
15 + 3 = 18	14 : 2 = 7
27 - 11 = 16	25 - 12 = 13
32 - 16 = 16	35 - 12 = 23
6 + 0 = 6	7 × 11 = 77
23 - 20 = 3	1 + 10 = 11
10 × 11 = 110	6 × 1 = 6