Question: what is the greatest common factor for 3 and 27?
Answer: The prime factorization of 3 is: 3. The prime factorization of 27 is: 3 x 3 x 3. The prime factors and multiplicities 3 and 27 have in common are: 3. 3 is the gcf of 3 and 27. gcf(3,27) = 3.