Question: what is the greatest common factor of 24 and 90 using prime factorization?
Answer: The prime factorization of 90 is: 2 x 3 x 3 x 5. The prime factors and multiplicities 24 and 90 have in common are: 2 x 3. 2 x 3 is the gcf of 24 and 90. gcf(24,90) = 6.