Compare and Order Fractions

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Compare and Order Fractions

• By Mr. Bales

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Objective

• By the end of the lesson, you will be able to
  compare and order simple fractions.
• Standard 4NS1.9 - Students will identify on a
  number line the relative positions of positive
  fractions..

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Introduce
1 4

• Which is larger, 1/5 or 1/4?
• Can you think of three fractions larger than 3/5?
• On your whiteboards, try to arrange the following
  fractions from least to greatest
• 3/5, 1/5, 4/5, 5/5, 2/5
• 1/10, 7/10, 5/10, 9/10, 3/10

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Get Ready to Learn

• Alejandro has an insect collection. The table
  shows the lengths of four insects in his
  collection. Which is longer, a field cricket or a
  whirligig beetle?

Insect Length
Mosquito 1/4
Field Cricket 5/8
Whirligig Beetle 3/8
Lightning Bug 1/2
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Compare Fractions

• Which is longer, a field cricket or a whirligig
  beetle?
• You can use models to compare 5/8 and 3/8.
• The model shows that 5/8 gt 3/8
• So, the field cricket is longer.

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Compare Fractions

• What is longer, a mosquito or a lightning bug?
• You need to compare 1/4 and 1/2.
• 1/2 gt 1/4 So, the lightning bug is longer.

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You Try

• On your whiteboards, order the following
  fractions from least to greatest
• (Use fractions models and drawings to help)
• 1/2, 3/4, 5/6, 1/3, 3/4, 1/6
• Without using fractions models, why is it hard to
  order fractions that do not have the same
  denominator?
• Try these from least to greatest
• 1/7, 1/4, 1/5, 1/3, 1/6, 1/2, 1/8
• Can you describe a rule when the numerators are
  all the same?

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Did I hear you say you need help from Mr. Haresty?
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Bales Bucks!!
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Assignment

• Page 530 - s 9 - 21
• Get them all correct - No Math Homework!!