Correction :

23 + 9 = 32	10 + 10 = 20
33 - 22 = 11	4 + 20 = 24
16 - 13 = 3	11 + 23 = 34
24 - 19 = 5	18 + 22 = 40
23 + 4 = 27	10 + 20 = 30
32 - 10 = 22	22 - 14 = 8
3 + 12 = 15	12 + 10 = 22
1 + 1 = 2	10 + 5 = 15
26 - 3 = 23	15 : 5 = 3
21 + 5 = 26	4 + 12 = 16