Question: what is the greatest common factor (gcf) of 12 and 96?
Answer: The common factors of 12 and 96 are 12, 6, 4, 3, 2, 1, intersecting the two sets above. In the intersection factors of 12 ∩ factors of 96 the greatest element is 12. Therefore, the greatest common factor of 12 and 96 is 12.