Answer:
30
Explanation:
So first, you have to list all (some) the multiples of 10:
10, 20, 30, 40, 50, 60, 70, 80, 90, 100
Now list some multiples of 6:
6, 12, 18, 24, 30, 36
Now you just look to see which factors 6 and 10 have in common and 30 is the least (smallest) common mutliple that the two numbers both share.