Correction :

3 × 8 = 24	5 - 5 = 0
9 : 3 = 3	13 + 4 = 17
3 + 7 = 10	3 + 3 = 6
31 - 18 = 13	5 + 22 = 27
7 : 7 = 1	4 - 0 = 4
28 - 9 = 19	5 × 2 = 10
33 - 14 = 19	20 : 4 = 5
11 + 17 = 28	6 + 8 = 14
9 + 14 = 23	21 - 19 = 2
10 + 3 = 13	2 × 9 = 18