Correction :

5 : 1 = 5	30 : 6 = 5
24 + 18 = 42	14 + 8 = 22
16 - 3 = 13	12 + 13 = 25
28 - 15 = 13	24 - 1 = 23
21 - 0 = 21	14 - 3 = 11
9 × 10 = 90	6 + 0 = 6
50 : 5 = 10	24 - 12 = 12
22 + 9 = 31	20 - 8 = 12
6 × 9 = 54	13 + 18 = 31
10 + 0 = 10	1 × 3 = 3