Correction :

9 + 2 = 11	29 - 8 = 21
11 + 4 = 15	16 - 5 = 11
4 × 1 = 4	25 - 9 = 16
11 + 3 = 14	19 - 10 = 9
2 + 0 = 2	6 + 11 = 17
26 - 8 = 18	2 + 24 = 26
14 + 5 = 19	6 + 15 = 21
12 - 8 = 4	10 + 2 = 12
24 + 6 = 30	2 + 16 = 18
39 - 21 = 18	34 - 24 = 10