GCF and LCM
GCF and LCM, or greatest common factor and least common multiple are all quite important in math. The GCF of 33 and 21 is 3 and the LCM is 231. This following video will tell you how to find that out using prime factorization. If you haven't looked at prime factorization yet, go take a look!
GCF and LCM Example
What is the GCF and LCM of 24 and 60?
24 60
2 12 2 30
2 6 2 15
2 3 3 5
GCF LCM
24: 2 2 2 3 2 2 2 3
60: 2 2 3 5 2 2 3 5
2×2×3=12 2×2×2×3×5=120
24 60
2 12 2 30
2 6 2 15
2 3 3 5
GCF LCM
24: 2 2 2 3 2 2 2 3
60: 2 2 3 5 2 2 3 5
2×2×3=12 2×2×2×3×5=120
GCF and LCM Practice Problem
What is the GCF and LCM of 36 and 54?
Answer Key
Answer Key