Correction :

18 - 9 = 9	27 - 22 = 5
21 - 4 = 17	21 - 7 = 14
9 × 2 = 18	23 + 1 = 24
24 - 0 = 24	18 + 1 = 19
5 × 3 = 15	26 - 4 = 22
17 - 15 = 2	10 + 6 = 16
29 - 5 = 24	6 - 5 = 1
8 × 10 = 80	23 + 22 = 45
99 : 9 = 11	10 + 11 = 21
22 + 9 = 31	25 - 7 = 18