Question: what are the greatest common factors for 12 and 49?
Answer: The prime factorization of 12 is: 2 x 2 x 3.
The prime factorization of 49 is: 7 x 7.
The prime factors and multiplicities 12 and 49 have in common are: 1.
1 is the gcf of 12 and 49.
gcf(12,49) = 1.