Greatest Common Factor (GCF)

The video tutorial explains the concept of greatest common factors (GCF) and demonstrates two methods to find the GCF of two numbers: listing all factors and using prime factorization. Examples are provided to illustrate each method, and the video concludes with a comprehension check.

What is the greatest common factor of 10 and 15?

• 10

• 5

• 3

• 2

Which of the following is a factor of both 18 and 24?

• 2

• 3

• 6

• 9

What is the first step in finding the greatest common factor using prime factorization?

• Multiply the numbers

• List all factors of the numbers

• Break down the numbers into prime factors

• Divide the numbers

In the prime factorization of 24, which of the following is NOT a prime factor?

• 2

• 3

• 4

• None of the above

What is the greatest common factor of 24 and 108 using prime factorization?

• 18

• 6

• 8

• 12