Fractions

Lesson 13

Math

Unit 6

3rd Grade

Lesson 13 of 24

Objective


Understand two fractions as equivalent if they are the same sized pieces of the same sized wholes, though not necessarily the same shape. Use this understanding to generate simple equivalent fractions.

Common Core Standards


Core Standards

  • 3.NF.A.3.A — Understand two fractions as equivalent (equal) if they are the same size, or the same point on a number line.
  • 3.NF.A.3.B — Recognize and generate simple equivalent fractions, e.g., 1/2 = 2/4, 4/6 = 2/3). Explain why the fractions are equivalent, e.g., by using a visual fraction model.

Criteria for Success


  1. Understand that equivalent fractions are fractions that are equal, i.e., they represent the same sized piece of the same whole, though not necessarily the same shape.
  2. Generate simple equivalent fractions with the use of an area model (MP.5).
  3. Explain the equivalence of fractions using a number line or other method (MP.3, MP.5).
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Anchor Tasks

25-30 minutes


Problem 1

Mrs. Allen and Ms. Roll each got the same kind of chocolate bar at the grocery store. Mrs. Allen broke her chocolate bar into three equal-sized pieces and ate one of those pieces. Ms. Roll broke her chocolate bar into six equal-sized pieces and ate two of those pieces. Who ate more chocolate, Mrs. Allen or Ms. Roll? Use the models below to support your reasoning.

Guiding Questions

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Student Response

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Problem 2

Jessie drew the following area model to represent a fraction.

Which of the following fractions are equivalent to the one represented above? Select all that apply.

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Guiding Questions

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Student Response

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Problem Set

15-20 minutes


Discussion of Problem Set

  • In #1, which shapes were most difficult to match? Why?
  • Look at #2. What pattern do you notice between the three sets of models? How does this pattern relate to other parts of today’s lesson?
  • How did you determine the other models that were equivalent to Figure Y? Which one was the most difficult to figure out? Why?
  • In #8, how do you know the way you shaded Figure B was equivalent to the way you shaded Figure C?

Target Task

5-10 minutes


Problem 1

Shade the model below to create a fraction that is equivalent to $$\frac{4}{8}$$.

Student Response

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Problem 2

Explain how you know the model above represents a fraction that is equivalent to $$\frac{4}{8}$$.

Student Response

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Additional Practice


The Extra Practice Problems can be used as additional practice for homework, during an intervention block, etc. Daily Word Problems and Fluency Activities are aligned to the content of the unit but not necessarily to the lesson objective, therefore feel free to use them anytime during your school day.

Word Problems and Fluency Activities

Word Problems and Fluency Activities

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Next

Express whole numbers as fractions, and recognize fractions that are equivalent to whole numbers.

Lesson 14
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Lesson Map

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Topic A: Understanding Unit Fractions and Building Non-Unit Fractions

Topic B: Fractions on a Number Line

Topic C: Equivalent Fractions

Topic D: Comparing Fractions

Topic E: Line Plots

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