Correction :

22 - 15 = 7	8 + 7 = 15
19 - 8 = 11	5 + 16 = 21
30 - 6 = 24	24 + 3 = 27
17 - 0 = 17	0 + 10 = 10
20 + 7 = 27	12 + 11 = 23
4 + 8 = 12	19 + 3 = 22
17 + 3 = 20	5 + 10 = 15
16 - 16 = 0	15 + 10 = 25
8 + 7 = 15	6 × 3 = 18
11 + 19 = 30	17 + 15 = 32