Correction :

2 + 2 = 4	2 × 9 = 18
33 - 18 = 15	5 + 10 = 15
24 - 9 = 15	18 + 0 = 18
81 : 9 = 9	4 + 9 = 13
14 - 8 = 6	8 + 12 = 20
29 - 16 = 13	15 + 17 = 32
7 × 5 = 35	12 : 2 = 6
24 + 6 = 30	5 - 5 = 0
5 × 8 = 40	13 + 13 = 26
110 : 10 = 11	18 - 5 = 13