Question: what is the greatest common factor of 44?
Answer: The prime factorization of 44 is: 2 x 2 x 11. The prime factorization of 40 is: 2 x 2 x 2 x 5. The prime factors and multiplicities 44 and 40 have in common are: 2 x 2. 2 x 2 is the gcf of 44 and 40. gcf(44,40) = 4.