Fractions

Lesson 8

Math

Unit 6

3rd Grade

Lesson 8 of 24

Objective


Place any fraction on a number line with endpoints 0 and 1.

Common Core Standards


Core Standards

  • 3.NF.A.2 — Understand a fraction as a number on the number line; represent fractions on a number line diagram.

Foundational Standards

  • 2.MD.B.6

Criteria for Success


  1. Plot a given fraction on a number line by partitioning a whole on the number line into fractional units and counting by unit fractions to locate the relevant point (MP.5).
  2. Determine the value of a plotted point by determining the fractional unit and counting them from 0.
  3. Plot a given fraction or determine the value of a plotted point in special cases, including number lines where more intervals beyond one whole are shown (e.g., 6 intervals of 1 fourth are shown with 1 whole labeled) or the whole is already partitioned into related fractions (e.g., the number line is partitioned into halves and needs to be partitioned into fourths).
  4. Determine the distance between two points on a number line. (Optional)

Tips for Teachers


  • Here is a neat Desmos activity you can use to supplement today’s lesson, essentially in place of Anchor Task 1. It’s a nice visualization to help students see the magnitude of fractions on fraction strips and then translates that to number lines.
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Anchor Tasks

25-30 minutes


Problem 1

Mark and label a point for each fraction below on the number line to its right.

a.    

$$\frac{1}{3}$$

b.    

$$\frac{5}{6}$$

c.    

$$\frac{3}{8}$$

Guiding Questions

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Student Response

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Problem 2

Determine the location of each of the following points.

a.   

b.   

Guiding Questions

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Student Response

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Problem 3

Erin walked 1 mile from her house to the library. Along the way, she passed several places shown on the number line below.

a.   Which place is $$\frac{4}{8} $$ mile from Erin’s house?

b.   Erin also passed the fire station, which is $$\frac{1}{8} $$ mile from Erin’s house. Plot the location of the fire station on the number line above.

c.   What is the distance, in miles, between the park and the market?

Guiding Questions

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Student Response

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References

EngageNY New York State Testing Program Grade 3 Common Core Mathematics Test Released Questions June 2017Question #9

From EngageNY.org of the New York State Education Department. New York State Testing Program Grade 3 Common Core Mathematics Test Released Questions June 2017. Internet. Available from https://www.nysed.gov/curriculum-instruction/engageny; accessed Sept. 25, 2018, 4:32 p.m..

Modified by Fishtank Learning, Inc.

Problem Set

15-20 minutes


Discussion of Problem Set

  • What is the distance from 0 to each of the fractions you plotted in #2? What is the distance from each of the fractions you plotted in #2 to 1? How are these pairs of fractions related to our work with shaded and unshaded portions of a whole?
  • How did you determine what fraction Point Q represented in #3? Why is it located at the same point as 1?
  • How did you determine what fraction Point B represented in #5?
  • What mistake did Shawn make in #6? How did you correct his mistake?
  • I think the Point P represents $$\frac{1}{6}$$ in #7. What mistake did I make?
  • How far does Barney live from the post office in #8? Is this the same or a different value than it would be if you were just labeled the value of that point? Why?
  • What made #9 more challenging than many of the previous problems?

Target Task

5-10 minutes


Problem 1

a.   Identify the fractions represented by each point on the number line below. 

b.    Explain how you determined the location of point B. 

Student Response

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Problem 2

Jermaine is making a beaded necklace. The number line below represents the whole length of necklace. Jermaine uses red beads for the first $$1\over 8$$ of the necklace. After the red beads, he switches to yellow beads for the next $$5\over 8$$ of the necklace. Label the point where Jermaine switches from red to yellow beads with the letter R and label the point where Jermaine finishes the yellow beads with the letter Y on the number line below.

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

Help students strengthen their application and fluency skills with daily word problem practice and content-aligned fluency activities.

Next

Place any fraction on a number line with endpoints 0 and another whole number greater than 1.

Lesson 9
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Lesson Map

A7CB09C2-D12F-4F55-80DB-37298FF0A765

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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