Question: what is the greatest common factor between 8 and 50?
Answer: The factors of 50 are 50, 25, 10, 5, 2, 1. The common factors of 8 and 50 are 2, 1, intersecting the two sets above. In the intersection factors of 8 ∩ factors of 50 the greatest element is 2. Therefore, the greatest common factor of 8 and 50 is 2.