Correction :

23 - 22 = 1	30 - 18 = 12
13 + 17 = 30	7 - 1 = 6
7 + 4 = 11	99 : 11 = 9
8 + 2 = 10	36 - 17 = 19
30 - 21 = 9	11 + 12 = 23
21 + 8 = 29	43 - 21 = 22
1 + 10 = 11	29 - 17 = 12
19 + 17 = 36	22 - 4 = 18
3 × 5 = 15	16 + 1 = 17
24 + 16 = 40	9 + 3 = 12