What is the greatest common factor of 24 and 30?

The factors of 24 are: 1, 2, 3, 4, 6, 8, 12, 24 The factors of 30 are: 1, 2, 3, 5, 6, 10, 15, 30

Therefore, the common factors of 24 and 30 are: 1, 2, 3, and 6.

The greatest of these common factors is 6.

Thus, the greatest common factor of 24 and 30 is 6.