Correction :

19 + 11 = 30	25 - 3 = 22
16 + 15 = 31	26 - 19 = 7
22 - 15 = 7	11 + 15 = 26
30 - 6 = 24	6 × 10 = 60
22 + 8 = 30	0 + 17 = 17
9 + 4 = 13	22 - 18 = 4
17 + 24 = 41	6 - 2 = 4
26 - 14 = 12	19 + 2 = 21
8 + 23 = 31	11 + 7 = 18
6 + 22 = 28	23 + 1 = 24