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```Greatest Common Factor
Created by
Cristina Salas Leal
November 17, 2007
Objective

The students will list factors of a number and
identify the greatest common factor of two or
more numbers.

TEKS (6.1E) The student is expected to identify
factors of a positive integer, common factors,
and the greatest common factor of a set of
positive integers.
Math Journal

What does GCF stand for?
 How do you factor?
 What is a factor?

What is a factor?

A factor is whole number that divides into
another whole number evenly.
Example:
Factors of 12: 1, 2, 3, 4, 6, 12
Climb the mountain

Factors of 12
4
3
6
2
1
12
12
Use a Rainbow

Factors of 18
Beach Clean Up
Volunteers arrive at the beach to help pick
up trash. There were 32 girls and 24 boys
ready to help. The coordinator wanted to
divide the boys and girls equally among
the groups. How many boys and girls
would be needed to make the largest
group possible?
Find the GCF

List the factors of 32 and 24
32: 1, 2, 4, 8, 16, 32
24: 1, 2, 3, 4, 6, 8, 12, 24
The greatest common factor is 8.
Internet Websites
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