Finding the Greatest Common Factor

This video tutorial teaches how to find the greatest common factor (GCF) of two or more numbers by listing and comparing their factors. It explains the difference between factors and multiples, and distinguishes between prime and composite numbers. The tutorial provides examples of finding the GCF for numbers like 32 and 60, as well as 12, 14, and 20, emphasizing the importance of identifying common factors and selecting the largest one.

What is a prime number?

• A number with exactly two factors

• A number with only one factor

• A number with more than two factors

• A number that is a multiple of 10

Which of the following is a composite number?

• 7

• 11

• 10

• 13

What is the greatest common factor of 32 and 60?

• 16

• 2

• 8

• 4

Which of the following is a common factor of 12, 14, and 20?

• 3

• 5

• 2

• 4

What is the greatest common factor of 12, 14, and 20?

• 1

• 4

• 2

• 3