Answer: 8
Explanation:
The least common multiple, or lcm, is simply the lowest number divisible by both numbers. A simple way to find the lcm is by simply "counting by the number" a few times.
i.e.
4, 8, 12, 16, 20, 24
8, 16, 24, 32, 40, 48
Then, after looking at the list, you should see a few shared numbers. The lowest of them is 8.
Hope it helps :) and let me know if you want me to elaborate.