Correction :

29 - 11 = 18	8 × 1 = 8
11 - 11 = 0	35 - 19 = 16
30 - 10 = 20	17 - 12 = 5
16 + 21 = 37	10 × 4 = 40
26 - 5 = 21	9 + 14 = 23
1 + 10 = 11	17 + 14 = 31
5 + 0 = 5	5 + 2 = 7
38 - 20 = 18	9 + 5 = 14
28 - 6 = 22	13 - 9 = 4
15 - 0 = 15	9 - 4 = 5