Correction :

3 × 2 = 6	15 + 17 = 32
10 + 18 = 28	49 : 7 = 7
10 : 5 = 2	4 + 19 = 23
10 + 11 = 21	3 - 3 = 0
27 - 24 = 3	31 - 14 = 17
20 + 2 = 22	6 : 2 = 3
39 - 20 = 19	20 : 5 = 4
9 + 0 = 9	4 : 1 = 4
24 - 9 = 15	30 : 6 = 5
8 + 11 = 19	25 - 4 = 21