Question: what is the greatest common factor for 14 and 55?
Answer: The prime factorization of 14 is: 2 x 7.
The prime factorization of 55 is: 5 x 11.
The prime factors and multiplicities 14 and 55 have in common are: 1.
1 is the gcf of 14 and 55.
gcf(14,55) = 1.