Math 6 Lesson 5-3
Published on Nov 28, 2015
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Math 6 Lesson 5-3
Greatest Common Factor
In this lesson you will learn to find the GCF
(Greatest Common Factor) of two numbers.
GCF
Greatest Common Factor
Photo by Stephen & Claire Farnsworth
The greatest number that divides into two numbers is the GCF.
How do we find the GCF?
Photo by thepartycow
We will be using GCF later on to help
us simplify or reduce fractions.
Step One: Find the Factors
Let's find the GCF of 12 and 40.
Step Two: List the factors
12-1,2,3,4,6,12
40-1,2,4,5,8,10,20,40
Step Three: Circle the common factors and find the greatest one.
12-1,2,3,4,6,12
40-1,2,4,5,8,10,20,40
Step One: Find the Factors
Let's find the GCF of 18 and 63.
Step Two: List the factors
18-1,2,3,6,9,18
63-1,3,7,9,21,63
Step Three: Circle the common factors and find the greatest one.
18-1,2,3,6,9,18
63-1,3,7,9,21,63
You try! Find the GCF of...
- 36 and 42
- Stop the video, complete the problem
- Turn the video back on to check your work.
GCF of 36, 42
You try! Find the GCF of...
- 18 and 24
- Stop the video, complete the problem
- Turn the video back on to check your work.
GCF of 18, 24
Your next assignment is to use the QR code
provided and complete the Google form with your ipad partner.
