What are the common factors of 12 and 24?

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

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.

Thus, the common factors of 12 and 24 are 1, 2, 3, 4, 6, and 12, and the GCF is 12.