Correction :

13 - 6 = 7	5 : 1 = 5
19 - 17 = 2	0 + 5 = 5
32 - 10 = 22	8 × 9 = 72
42 - 19 = 23	40 : 8 = 5
32 - 19 = 13	29 - 9 = 20
11 + 23 = 34	19 - 5 = 14
0 + 11 = 11	7 + 15 = 22
23 + 4 = 27	22 + 24 = 46
42 : 6 = 7	7 + 5 = 12
16 + 24 = 40	11 - 11 = 0