Correction :

11 × 8 = 88	18 + 15 = 33
9 : 9 = 1	22 + 3 = 25
29 - 13 = 16	20 + 5 = 25
16 + 20 = 36	27 - 3 = 24
18 + 13 = 31	21 - 7 = 14
25 - 15 = 10	2 + 5 = 7
26 - 11 = 15	33 - 13 = 20
11 + 9 = 20	23 + 17 = 40
99 : 9 = 11	1 - 0 = 1
2 + 13 = 15	16 - 5 = 11