We list the multiples of 3 and 8 and select the common ones.
Then, the least out of those is the LCM (Least Common Multiple).
The first few multiples of "3" and "8" are:
3 - 3, 6, 9, 12, 15, 18, 21, 24, 27, 30 ...
8 - 8, 16, 24, 32, 40 ...
The common multiple is 24 and it is the least.
Thus,
The LCM of 3 and 8 is 24
Answer
24