Question: what is the greatest common factor between 49 and 9?
Answer: The prime factorization of 9 is: 3 x 3. The prime factorization of 49 is: 7 x 7. The prime factors and multiplicities 9 and 49 have in common are: 1. 1 is the gcf of 9 and 49. gcf(9,49) = 1.