Answer
12
Work Step by Step
2, 3, 4
First let's note down the multiples of each.
Multiples of 2 : 2, 4, 6, 8, 10, 12,..
Multiples of 3 : 3, 6, 9, 12, 15, 18,..
Multiples of 4 : 4, 8, 12, 16, 20, 24,..
Looking at the above, 12 is the least common multiple of 2, 3, 4.