Greatest Common Factors and Prime Factorization

This video tutorial explains how to find the greatest common factor (GCF) of 32 and 80 using a factor tree and prime factorization chart. The instructor demonstrates the process of breaking down each number into its prime factors and then identifies the GCF by finding common vertical pairs. The GCF is calculated to be 16. The video concludes with a brief channel promotion.

What is the greatest common factor (GCF)?

• The difference between two numbers

• The sum of two numbers

• The smallest number that divides two numbers

• The largest number that divides two numbers

Which method is used in the video to find the factors of 32 and 80?

• Long division

• Prime number listing

• Multiplication table

• Factor tree

What is the first step in creating a factor tree for the number 32?

• Divide by 10

• Divide by 5

• Divide by 2

• Divide by 3

How many times does the number 2 appear in the factorization of 32?

• Two times

• Three times

• Five times

• Four times

What is the purpose of creating a prime factorization chart?

• To list all numbers

• To identify common prime factors

• To find the sum of factors

• To divide numbers equally

Which number is not a prime factor of 80?

• 3

• 2

• 10

• 5

What is the greatest common factor of 32 and 80?

• 20

• 12

• 16

• 8