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Comparing and Order Fractions with Unlike
Denominators
Copyright © 2013 Kelly Mott
Comparing FractionsPart 1: ReviewPart 2: Lesson
Copyright © 2013 Kelly Mott
REVIEW
Copyright © 2013 Kelly Mott
FOCUS QUESTION: What symbols do we
use when we compare fractions?
Copyright © 2013 Kelly Mott
Symbols
means ______________________.
means ______________________.
means ______________________.
Copyright © 2013 Kelly Mott
FOCUS QUESTION: How do we compare
fractions with different denominators?
Copyright © 2013 Kelly Mott
• There are two ways to compare fractions with different denominators.
Copyright © 2013 Kelly Mott
• If fractions do not have the same denominators, we need to find a common multiple and multiply to get the bottoms the same.
2 4
3 8
Copyright © 2013 Kelly Mott
4 3 8 4
Practice 1:
Copyright © 2013 Kelly Mott
2 1 3 6
Practice 2:
Copyright © 2013 Kelly Mott
• Another way to compare fractions is to use the butterfly method and cross multiply.
2 4
3 8
Copyright © 2013 Kelly Mott
2 3 5 10
Practice 1:
Copyright © 2013 Kelly Mott
1 2 3 9
Practice 2:
Copyright © 2013 Kelly Mott
How did you do?
Copyright © 2013 Kelly Mott
FOCUS QUESTION: How do we find the fraction with the greatest value
in a set?
Copyright © 2013 Kelly Mott
• To find the fraction with the greatest value, you must first make all the fractions have a common denominator.
• Circle the fraction with the greatest value.
7 10
2 5
Copyright © 2013 Kelly Mott
10 9
• To find the fraction with the greatest value, you must first make all the fractions have a common denominator.
• Circle the fraction with the greatest value.
3 8
2 4
Copyright © 2013 Kelly Mott
6 2
• To find the fraction with the greatest value, you must first make all the fractions have a common denominator.
• Circle the fraction with the greatest value.
4 6
6 12
Copyright © 2013 Kelly Mott
10 7
• To find the fraction with the greatest value, you must first make all the fractions have a common denominator.
• Circle the fraction with the greatest value.
3 10
4 5
Copyright © 2013 Kelly Mott
20 12
• To find the fraction with the greatest value, you must first make all the fractions have a common denominator.
• Circle the fraction with the greatest value.
4 6
1 3
Copyright © 2013 Kelly Mott
12 7
FOCUS QUESTION: How do we put fractions in order from greatest to
least?
Copyright © 2013 Kelly Mott
• To put fractions in order from greatest to least, find the common denominator. Then list from big to small.
• Order from Greatest to Least:
2 5
1 3
Copyright © 2013 Kelly Mott
10 3
• To put fractions in order from greatest to least, find the common denominator. Then list from big to small.
• Order from Greatest to Least:
3 4
5 8
Copyright © 2013 Kelly Mott
2 1
• To put fractions in order from greatest to least, find the common denominator. Then list from big to small.
• Order from Greatest to Least:
2 4
2 3
Copyright © 2013 Kelly Mott
12 7
FOCUS QUESTION: How do we put fractions in
order from least to greatest?
Copyright © 2013 Kelly Mott
• To put fractions in order from least to greatest, find the common denominator. Then list from small to big.
• Order from Least to Greatest:
4 12
1 3
Copyright © 2013 Kelly Mott
4 3
• To put fractions in order from least to greatest, find the common denominator. Then list from small to big.
• Order from Least to Greatest:
4 12
1 3
Copyright © 2013 Kelly Mott
6 5
• To put fractions in order from greatest to least, find the common denominator. Then list from big to small.
• Least to Greatest:
3 5
12 20
Copyright © 2013 Kelly Mott
10 5
PRACTICE: Word Problems
Copyright © 2013 Kelly Mott
1. Amy’s math notebook weighs ½ pound, her science notebook weighs 7/8 pound, and her history notebook weighs ¾ pound. What are the weights in order from lightest to heaviest?
Question: Steps:
Solve: Answer in Words:
Copyright © 2013 Kelly Mott
2. Carl has three picture frames. The thicknesses of the frames are 4/5 inch. 3/12 inch, and 5/6 inch. What are the thicknesses in order from least to greatest?
Question: Steps:
Solve: Answer in Words:
Copyright © 2013 Kelly Mott
How did you do?
Copyright © 2013 Kelly Mott
Copyright © 2013 Kelly Mott