Fraction Operations

Lesson 21

Math

Unit 5

4th Grade

Lesson 21 of 21

Objective


Solve problems using information presented in line plots.

Common Core Standards


Core Standards

  • 4.MD.B.4 — Make a line plot to display a data set of measurements in fractions of a unit (1/2, 1/4, 1/8). Solve problems involving addition and subtraction of fractions by using information presented in line plots. For example, from a line plot find and interpret the difference in length between the longest and shortest specimens in an insect collection.

Foundational Standards

  • 3.MD.B.4

Criteria for Success


  1. Solve word problems involving information presented in a line plot (MP.4), including questions that ask students to:
    1. Find the sum of values (or a subset of values) presented in the line plot and 
    2. Find the difference between the largest and smallest values in the line plot. 
  2. Construct a line plot (as a spiral from Lesson 21).
  3. Reason inductively about data in a line plot to make a plausible argument that takes into account the context from which the data arose (e.g., based on this data, what is typical?) (MP.3).

Tips for Teachers


“Grade 4 students learn elements of fraction equivalence (4.NF.1) and arithmetic, including multiplying a fraction by a whole number (4.NF.4) and adding and subtracting fractions with like denominators (4.NF.3). Students can use these skills to solve problems, including problems that arise from line plots” (MD Progression, p. 11).

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Anchor Tasks

25-30 minutes


Problem 1

Look back at yesterday’s data regarding the distances Ms. Smith’s class ran. 

a.   How many students ran less than $${2{1\over2}}$$ miles?

b.   What is the difference between the longest and the shortest distance ran?

c.   What is the total distance the students ran?

Guiding Questions

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Student Response

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References

EngageNY Mathematics Grade 4 Mathematics > Module 5 > Topic E > Lesson 28Concept Development

Grade 4 Mathematics > Module 5 > Topic E > Lesson 28 of the New York State Common Core Mathematics Curriculum from EngageNY and Great Minds. © 2015 Great Minds. Licensed by EngageNY of the New York State Education Department under the CC BY-NC-SA 3.0 US license. Accessed Dec. 2, 2016, 5:15 p.m..

Modified by Fishtank Learning, Inc.

Problem 2

Some fourth-grade students who were interested in seeing how heights of students change for kids around their age measured the heights of a sample of eight-year-olds and a sample of ten-year-olds. Their data are plotted below.

Describe the key differences between the heights of these two age groups.

Guiding Questions

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Student Response

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References

Institute for Mathematics and Education Progression for the Common Core State Standards, K–3, Categorical Data; Grades 2–5, Measurement Datap. 13

Progression for the Common Core State Standards, K–3, Categorical Data; Grades 2–5, Measurement Data, by the Common Core Standards Writing Team is made available by Institute for Mathematics and Education, University of Arizona. © 2007 The Arizona Board of Regents. All contents copyrighted. All rights reserved. Accessed April 3, 2019, 6:22 p.m.. For updates and more information about the Progressions, see http://ime.math.arizona.edu/progressions.

Modified by Fishtank Learning, Inc.

Problem Set

15-20 minutes


Discussion of Problem Set

  • Which expression is correct in #1? How do you know? 
  • In #2, how can you tell that options (c) and (d) are unreasonable? How might estimation help you?
  • How did multiplication help you with certain computations? Which problems did you use multiplication to help solve? 

Target Task

5-10 minutes


Isaac recorded how much time, in hours, he spent reading each week in the line plot below.

a.   What’s the difference between the greatest number of hours Isaac spent reading versus the least?

b.   How many hours did Isaac spend reading in total?

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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Lesson Map

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

Topic A: Building, Adding, and Subtracting Fractions Less Than or Equal to 1

Topic B: Building, Adding, and Subtracting Fractions Less Than 2

Topic C: Building, Adding, and Subtracting Fractions Greater Than or Equal to 2

Topic D: Multiplication of Fractions

Topic E: Line Plots

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