Correction :

0 + 2 = 2	31 - 20 = 11
4 + 11 = 15	21 - 3 = 18
14 - 11 = 3	32 : 8 = 4
0 + 18 = 18	27 - 4 = 23
11 + 10 = 21	39 - 21 = 18
21 + 22 = 43	70 : 7 = 10
6 + 23 = 29	2 + 7 = 9
4 : 2 = 2	10 - 3 = 7
24 - 12 = 12	25 - 20 = 5
22 + 16 = 38	14 + 10 = 24