Answer:
4
Step-by-step explanation:
You would have to list the multiples of each one.
2: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, so on...
4: 4, 8, 12, 16, 20, 24, 28, 32, 36, 40, so on...
So many numbers are common in these^, but 4 is the smallest....so that would be the answer.
Hope this helps :D
