Download Chapter 8 Lesson 2.notebook

Chapter 8 Lesson 2.notebook
February 28, 2014
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Chapter 8 Lesson 2.notebook
February 28, 2014
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Chapter 8 Lesson 2.notebook
February 28, 2014
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Chapter 8 Lesson 2.notebook
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New Vocabulary
Common Factors: shared factors
Greatest Common Factor (GCF): largest shared factors
Example: 14 and 28
common factors include 1,2,7,14
greatest common factor is 14
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Chapter 8 Lesson 2.notebook
February 28, 2014
By The End of the Lesson
You should understand:
­you can write the prime factorization to find common factors of two or more numbers
­the greatest of the common factors of two or more numbers is called the GCF, greatest common factor
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Chapter 8 Lesson 2.notebook
February 28, 2014
Greatest
Common
Factor
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Chapter 8 Lesson 2.notebook
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Definition:
The Greatest Common Factor is the greatest number
that is a factor of two or more numbers.
Example: The GCF of 6 and 8 =
2
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Chapter 8 Lesson 2.notebook
February 28, 2014
There are several ways to find the
GCF between two numbers.
One way that you have learned is just to list the factors.
Factors of 12 = (1, 2, 3, 4, 6, 12)
Factors of 24 = (1, 2, 3, 4, 6, 8, 12, 24)
Then, you circle the common factors and find the largest one which is
the........GREATEST COMMON FACTOR!
What is the GCF of 12 and 24?
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Answer
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Chapter 8 Lesson 2.notebook
February 28, 2014
Another way to find the GCF
between two numbers is to use a
factor tree.
12
24
2
6
4
4
3
2
2
2 X 2 X 3 = 12
2
2
3
2 X 2 X 2 X 3 = 24
GCF = 2 x 2 x 3 = 12
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Chapter 8 Lesson 2.notebook
February 28, 2014
Find the GCF of 12 and 66.
(Teacher led)
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Chapter 8 Lesson 2.notebook
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Find the GCF of 36 and 45.
(Teacher led)
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Page 557
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Homework pages 561­562
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Vocabulary Cards Review:
numerator
denominator
fraction
common factor
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