5.5 Ordering Fractions

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5.5  Ordering Fractions

Objective: Compare and order fractions.

Image: 'Fractional Hugs and Kisses'www.flickr.com/photos/84617037@N00/60431147

Mr. WilliamsGESD

jwilliams@gesd40.orghttp://mrwilliams.edublogs.org

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Vocabulary

Least Common Denominator (LCD)  ­  the least common multiple of the denominators of two fractions.

Image: 'Chairs'www.flickr.com/photos/46555636@N00/2981776

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Which is larger?

Compare              and          . Which is larger?34

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http://www.shodor.org/interactivate/activities/FractionSorter/

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Comparing Fractions using the LCD.

Compare           and         .56

79

1. Find the LCD: The LCD of 6 and 9 is 18.

56 =

5 x 36 x 3 =

1518

79 =

7 x 29 x 2 =

1418

Which is bigger? 15        1418        18or

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5         29         9

1        16        8

5        37        4

2         65        15

>

>

<

=

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Ordering Fractions

Order the fractions        ,        ,         from least to greatest. 310

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1. What is the LCD of 10, 5, and 4?     Your right, it's 20!

2. Make equivalent fractions using 20 as the denominator.

 3  x 2        610 x 2       20

2   x 4       8   5   x 4      20

1   x 5        54   x 5       20  

=

=

=

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Order the following fractions from least to greatest in your math notes!

3       2      54       3      8

5      3       79      4      12

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