Question: what is the greatest common factor in 8 and 52?
Answer: The factors of 52 are 52, 26, 13, 4, 2, 1. The common factors of 8 and 52 are 4, 2, 1, intersecting the two sets above. In the intersection factors of 8 ∩ factors of 52 the greatest element is 4. Therefore, the greatest common factor of 8 and 52 is 4.