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Jon and Elly are making treat bags for their class party.
Jon brought 32 pieces of gum.
Elly brought 40 mints.
What is the greatest numberof equal treat bags they can make?
In this lesson you will learn how to find the
greatest common factor of two whole numbers
by listing factor pairs.
Let’s Review
Both 3 and 4 are factors of 12.
Factors are numbers multiplied together to equal a product.
3 x 4 = 12
For example:
3 x 4 is a factor pair.
Let’s Review
Let’s Review
Core Lesson
3 steps to finding the Greatest Common Factor
1. List the factor pairs.
2. Identify the common factors.
3. Find the biggest common factor. That is the Greatest Common Factor (GCF)
Core Lesson
Compare the factor pairs of 12 and 18.
1, 2, 3, and 6
2. Find common factors
3. Find GCF
1. List factor pairs
Jon and Elly are making treat bags for their class party.
Jon brought 32 pieces of gum.
Elly brought 40 mints.
What is the greatest numberof equal treat bags they can make?
Core Lesson
Find the greatest common factor of 32 and 40.
3. Find GCF 1, 2, 4, 8
1. List factor pairs
2. Find common factors
Core Lesson
Jon brought 32 pieces of gum.
4 gum 4 gum 4 gum 4 gum
4 gum 4 gum 4 gum 4 gum
Core Lesson
Elly brought 40 mints.
5 mints 5 mints 5 mints 5 mints
5 mints 5 mints 5 mints 5 mints
Core Lesson
5 mints 5 mints 5 mints 5 mints 5 mints 5 mints 5 mints 5 mints
The greatest number of equal treat bags Jon and Elly can make is 8.
4 gum 4 gum4 gum 4 gum4 gum 4 gum4 gum 4 gum
5 mints5 mints 5 mints 5 mints5 mints 5 mints5 mints 5 mints4 gum 4 gum 4 gum4 gum 4 gum4 gum 4 gum4 gum
Jon and Elly can combine bags.
In this lesson you have learned how to find the greatest
common factor of two whole numbers by listing factor pairs.