Name a number that is a factor of both 12 and 24

What don't you understand about this problem?

Could it be 4

Yes. 4 is one of the common factors.

Other common factors are 2, 3, 6 and 12.

To find a number that is a factor of both 12 and 24, we can first list out the factors of each number and then look for a common factor.

The factors of 12 are 1, 2, 3, 4, 6, and 12.
The factors of 24 are 1, 2, 3, 4, 6, 8, 12, and 24.

Now, let's find the common factors by comparing the two lists. The common factors of both 12 and 24 are 1, 2, 3, 4, 6, and 12.

So, any of these numbers (1, 2, 3, 4, 6, and 12) can be considered as a number that is a factor of both 12 and 24.