LESSON 4-6 Simplifying
Fractions
Page 164
Simplify: 12
24
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Divide the numerator and the denominator
by a common factor.
I will show you three different ways to do this
problem.
12 divided by 2 =6 6 divided by 6 = 1
24 divided by 2=12 12 divided by 6 = 2
***Notice divide the numerator and the
denominator by the same number!!!!
Simplify: 12
24
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Find GCF: (Write as prime factorization)
 12= 2 x 2 x 3
 24= 2 x 2 x 2 x 3
 GCF is 2x2x3=12….. So divide each by 12
 12 divided by 12 is one
 24 divided by 12 is 2…. Answer 1/2
Simplify: 12
24
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Write number as prime factorizations and cross out
common numbers.
12= 2 x 2 x 3
24= 2 x 2 x 2 x 3
Cross out what they have in common
12= 2 x 2 x 3
24= 2 x 2 x 2 x 3
What is left? Looks like nothing on top, really is a
one because 2 divided by 2 is 1, 3 divided by 3 is 1,
answer is ½.
You decide which way you like
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Simplify: 18
30
Answer: 3/5
Simplify: 42
105
Answer: 2/5
More examples
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24
32
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Answers:
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¾
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18
27
2/3
Assignment:
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Worksheet Practice 4-6
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QUIZ ON FRIDAY OVER 4-4
THROUGH 4-6