Correction :

0 + 18 = 18	6 + 20 = 26
21 + 2 = 23	15 + 19 = 34
7 × 1 = 7	14 + 22 = 36
8 + 3 = 11	37 - 18 = 19
5 + 15 = 20	11 - 1 = 10
6 + 1 = 7	12 + 20 = 32
23 - 2 = 21	20 - 11 = 9
28 - 21 = 7	24 : 6 = 4
15 + 13 = 28	5 + 19 = 24
38 - 21 = 17	21 + 14 = 35