Greatest Common Factor and Least Common Multiple

Master GCF and LCM with fun practice! Includes prime factorization and factor matching.

What is the greatest common factor of 6 and 15? 2 3 5 7 What is the prime factorization of 56? 2 x 7 2 x 2 x 7 2 x 2 x 2 x 7 2 x 2 x 2 x 7 x 7 x 7 What is the prime factorization of 24? 2 x 2 x 3 2 x 2 x 2 x 3 8 x 3 6 x 4 What is the greatest common factor of 12 and 18? 3 9 4 6 What is the least common multiple of 12 and 18? 28 36 60 72 What is the least common multiple of 15 and 25? 30 45 50 75 Factors Match the factors to the correct numbers. 15 1, 3, 5, 15 6 1, 2, 3, 6 9 1, 3, 9 10 1, 2, 5, 10 12 1, 2, 3, 4, 6, 12 18 1, 2, 3, 6, 9, 18