Transcript MJ2 - Davidsen Middle School

MJ2
Ch 5.2 – Greatest Common Factor
Bellwork
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1.
2.
3.
Find the prime factorization of
each number
44
39
81
Assignment Review

Practice Skills Workbook lesson 5.1

If you have not turned in this
assignment, please make sure that you
do today.
Before we begin….


Please take out your notebook and
get ready to work
Today we will look at the Greatest
Common Factor of 2 or more
numbers….
Objective
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Students will find the GCF of 2 or
more numbers
Factors
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Raise your hand if you can tell me
what a factor is….
Factors
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A factor is one of the 2 numbers
that are multiplied to get a product.
Example
2•3=6
Product
Factors
Greatest Common Factor
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As the name suggests the Greatest
Common Factor (GCF) of two or
more numbers is the largest factor
that both numbers have in
common…
There are two ways to find the GCF
1.
2.
Listing of all the factors
Prime factorization of each number
GCF by Listing Factors

Demonstrate on Board using the
following numbers:
20 & 24
GCF using Prime Factorization
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Demonstrate on board using the
following numbers:
20 & 24
Advantages of Prime Factorization
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If you have a very large number it
is difficult to list all the factors –
unless you know all your
multiplication tables by rote
memorization….
Your Turn

1.
2.
3.
In the notes section of your
notebook determine the GCF of
each of the following:
8 & 10
6 & 12
10 & 17
Summary
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In the notes section of your
notebook summarize the key
concepts covered in today’s lesson
Today we discussed GCF


What is GCF…
What are two ways to find the GCF of
two or more numbers
Assignment

Text p. 205 # 9 – 20


This assignment is due tomorrow
Please make sure that you have a
heading and are labeling the
assignment.