Question: what is the greatest common factor of 24 and 30 using prime factorization?
Answer: The prime factorization of 30 is: 2 x 3 x 5. The prime factors and multiplicities 24 and 30 have in common are: 2 x 3. 2 x 3 is the gcf of 24 and 30. gcf(24,30) = 6.