Fraction Equivalence and Ordering

Lesson 3

Math

Unit 4

4th Grade

Lesson 3 of 15

Objective


Find factor pairs for numbers to 100 and recognize that a whole number is a multiple of each of its factors.

Common Core Standards


Core Standards

  • 4.OA.B.4 — Find all factor pairs for a whole number in the range 1—100. Recognize that a whole number is a multiple of each of its factors. Determine whether a given whole number in the range 1—100 is a multiple of a given one-digit number. Determine whether a given whole number in the range 1—100 is prime or composite.

Criteria for Success


  1. Understand that factors are numbers that when multiplied together give a certain product (e.g., 3 is a factor of 24 since $$3\times8=24$$). 
  2. Understand that a factor pair is the pair of numbers that when multiplied together give a certain product (e.g., 2 and 12 are a factor pair of 24 since $$2\times12=24$$). 
  3. Find all factors of a certain number, ensuring that the list is comprehensive. 
  4. Understand that a whole number is a multiple of each of its factors (e.g., 24 is a multiple of 2, 3, and 12 [among other numbers] since they are each a factor of 24).

Tips for Teachers


  • Students learned the term “factor” in Grade 3 but not the term “factor pair”.
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Anchor Tasks

25-30 minutes


Problem 1

Mr. Duffy wants to set up the desks in his room in rows and columns. There are 28 desks in his classroom. What are the different ways he could make rows and columns with 28 desks? Draw arrays to represent the possible arrangements.

Guiding Questions

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Student Response

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Problem 2

a.   Find all of the factors of 98. 

b.   How can you be sure your list is exhaustive? In other words, how can you be sure there are no other factors that you haven’t listed? 

Guiding Questions

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Student Response

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References

EngageNY Mathematics Grade 4 Mathematics > Module 3 > Topic F > Lesson 22Concept Development

Grade 4 Mathematics > Module 3 > Topic F > Lesson 22 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 3

a.   Find all of the factors of 60. 

b.   Find all of the numbers that have 60 as a multiple. 

c.   What do you notice about both of your lists above? What do you wonder? 

Guiding Questions

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Student Response

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References

EngageNY Mathematics Grade 4 Mathematics > Module 3 > Topic F > Lesson 22Concept Development

Grade 4 Mathematics > Module 3 > Topic F > Lesson 22 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 4

A restaurant is open 24 hours a day. The manager wants to divide the day into work shifts of equal length. Show the different ways this can be done. The shifts should not overlap, and all shifts should be a whole number of hours long.

Guiding Questions

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Student Response

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References

Kentucky Department of Education Operations and Algebraic Thinking: Number Puzzles Grade 4 Formative Assessment LessonStudent materials, Question #1

Problem Set

15-20 minutes


Discussion of Problem Set

  • Which number is a factor of every number? 
  • What were the factors of 13 in #1(f)? How do you know there aren’t any more factors than that?
  • Compare the factors in #1(d) and #1(i). 18 is double 9. What do you notice about their factors? 
  • Compare the factors in #1(b) and 1(j). 21 is triple 7. What do you notice about their factors?
  • In #1, what numbers have an odd number of factors? Why is that so? How is this related to your answer in #6?
  • What do you notice about the answers to each part of #4? What do you wonder? 
  • Explain the difference between factors and multiples.
  • Are the following true?
    • 3 is a factor of 12.
    • 12 is a multiple of 3.
    • 12 is divisible by 3.

Target Task

5-10 minutes


Problem 1

Find all the factors of each of the following numbers. 

a.   16

b.   30

c.   63

Student Response

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Problem 2

Complete the following:

a.   List the numbers that have 42 as a multiple.

b.   What are the factors of 42?

c.   Are your two lists the same? Why or why not?

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

Determine whether a given number is prime or composite.

Lesson 4
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Lesson Map

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

Topic A: Factors and Multiples

Topic B: Equivalent Fractions

Topic C: Comparing and Ordering Fractions

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