Finding GCF and LCM through Prime Factorization

What does GCF stand for?

• Greatest Common Fraction

• Greatest Composite Fraction

• Greatest Composite Factor

• Greatest Common Factor

Which number is the GCF of 24 and 40?

• 8

• 6

• 4

• 10

What is the LCM of 15 and 9?

• 75

• 60

• 45

• 30

What is prime factorization?

• Writing a number as a product of its prime factors

• Finding the greatest common factor

• Finding the least common multiple

• Listing all factors of a number

Which of the following is a prime factor of 24?

• 8

• 4

• 3

• 6

Tags

CCSS.4.OA.B.4

What is the prime factorization of 30?

• 2 x 3 x 5

• 2 x 5 x 7

• 3 x 5 x 7

• 2 x 3 x 7

Which common prime factors are found in both 30 and 48?

• 2 and 3

• 3 and 5

• 2 and 5

• 2 and 7

What is the GCF of 30 and 48?

• 8

• 4

• 5

• 6

What is the LCM of 12 and 15?

• 30

• 45

• 60

• 75

What is the first step in finding the LCM using prime factorization?

• List all multiples

• Find the GCF

• Multiply all factors

• List all factors