Grade 6 Practice

Factors and Multiples

Use factors and prime factorization to find GCF and LCM. For prime factorizations, list primes from smallest to largest separated by *, without exponents.

Practice Questions

10 questions

1
Write the prime factorization of 24.
2
Write the prime factorization of 60.
3
Find the GCF of 18 and 24.
4
Find the GCF of 36 and 48.
5
Find the LCM of 6 and 8.
6
Find the LCM of 12 and 18.
7
Two bells ring every 4 and 6 minutes. They ring together now. In how many minutes will they next ring together?
8
You have 24 red beads and 36 blue beads. What is the greatest number of identical groups using all beads?
9
Two numbers have prime factorizations 2 × 2 × 3 and 2 × 3 × 5. What is their GCF?
10
Two numbers have prime factorizations 2 × 2 × 3 and 2 × 3 × 5. What is their LCM?

Complete the questions, then check your answers.