Correction :

7 + 19 = 26	0 + 8 = 8
17 + 7 = 24	2 + 7 = 9
24 + 22 = 46	23 + 23 = 46
8 + 8 = 16	5 × 10 = 50
15 + 17 = 32	25 - 4 = 21
18 + 9 = 27	18 - 10 = 8
24 + 0 = 24	30 : 10 = 3
6 + 13 = 19	33 - 12 = 21
11 + 8 = 19	7 + 23 = 30
21 + 21 = 42	11 × 5 = 55