Correction :

24 + 18 = 42	8 + 5 = 13
26 - 23 = 3	34 - 11 = 23
26 - 2 = 24	5 + 5 = 10
11 + 18 = 29	11 - 6 = 5
13 - 11 = 2	11 × 7 = 77
20 - 12 = 8	29 - 13 = 16
24 + 13 = 37	8 × 3 = 24
15 + 23 = 38	16 + 24 = 40
15 + 10 = 25	22 + 14 = 36
12 + 10 = 22	23 + 9 = 32