Correction :

24 - 11 = 13	5 + 10 = 15
10 × 4 = 40	27 - 12 = 15
5 + 20 = 25	34 - 10 = 24
22 + 15 = 37	26 - 22 = 4
18 : 3 = 6	40 - 16 = 24
0 + 24 = 24	9 × 1 = 9
42 : 6 = 7	36 - 22 = 14
6 × 6 = 36	19 - 19 = 0
39 - 15 = 24	41 - 20 = 21
17 + 2 = 19	15 - 13 = 2