Correction :

37 - 16 = 21	20 + 4 = 24
48 : 8 = 6	46 - 23 = 23
13 + 17 = 30	2 + 23 = 25
5 - 4 = 1	8 + 14 = 22
23 - 5 = 18	28 - 24 = 4
16 + 0 = 16	22 - 10 = 12
15 + 3 = 18	4 + 16 = 20
27 - 23 = 4	9 + 8 = 17
30 - 6 = 24	110 : 10 = 11
39 - 22 = 17	4 - 3 = 1