Greatest Common Factor

Greatest Common Factor

by Kevvin Hankins

Listing Method

• 16 = 1, 2, 4, 8, 16

• 24 = 1, 2, 3, 4, 6, 8, 12, 24

• If we will compare the list of factors of 16 and 24, we can identify the common factors.

• GCF is the highest common factor that appears on the list.

• The GCF of 16 and 24 is 8.

Greatest Common Factor

One way we find the Greatest Common Factor between two numbers is by LISTING and IDENTIFYING

Multiple Choice

What is the Greatest Common Factor of 40 and 100?

• 20

• 10

• 5

• 1

Another way to find GCF is by the LADDER METHOD

Multiple Choice

What is the GCF of 15 and 20?

• 2

• 0

• 1

• 5

Multiple Choice

What is the GCF of 9 and 4?

• 0

• 1

• 3

• 5

Multiple Choice

What is the GCF of 56 and 80?

• 8

• 4

• 2

• 1

Multiple Choice

What is the GCF of 60 and 85?

• 1

• 7

• 12

• 5