Question: what is the greatest common factor for 7 and 8?
Answer: The prime factorization of 7 is: 7. The prime factorization of 8 is: 2 x 2 x 2. The prime factors and multiplicities 7 and 8 have in common are: 1. 1 is the gcf of 7 and 8. gcf(7,8) = 1.