Fraction Operations
Lesson 10
Objective
Convert mixed numbers to fractions greater than 1.
Common Core Standards
Core Standards
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4.NF.B.3.B — Decompose a fraction into a sum of fractions with the same denominator in more than one way, recording each decomposition by an equation. Justify decompositions, e.g., by using a visual fraction model. Examples: 3/8 = 1/8 + 1/8 + 1/8 ; 3/8 = 1/8 + 2/8 ; 2 1/8 = 1 + 1 + 1/8 = 8/8 + 8/8 + 1/8.
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4.NF.B.3.C — Add and subtract mixed numbers with like denominators, e.g., by replacing each mixed number with an equivalent fraction, and/or by using properties of operations and the relationship between addition and subtraction.
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4.NF.B.4.A — Understand a fraction a/b as a multiple of 1/b. For example, use a visual fraction model to represent 5/4 as the product 5 × (1/4), recording the conclusion by the equation 5/4 = 5 × (1/4).
Criteria for Success
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- Convert from fractions greater than 1 to mixed numbers using a number line or other model.
- Convert from fractions greater than 1 to mixed numbers using the general method, i.e., "by representing the whole number as an equivalent fraction, e.g., $$7\frac{1}{5}=7+\frac{1}{5}=\frac{35}{5}+\frac{1}{5}=\frac{36}{5}$$" (NF Progression, p. 12).
Tips for Teachers
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Before the Problem Set, you could have students play a game to practice converting mixed numbers to fractions greater than 1, such as “Jump Around” or “Sealed Bids" from Games with Fraction Strips and Fraction Cards on The Max Ray Blog.
Remote Learning Guidance
If you need to adapt or shorten this lesson for remote learning, we suggest prioritizing Anchor Task 2 (benefits from worked example). Find more guidance on adapting our math curriculum for remote learning here.
Anchor Tasks
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Problem 1
Mrs. Fowler knew that the perimeter of the soccer field was $${{1\over6}}$$ mile. She walked $$2{{{1\over6}}}$$ miles in total. How many times did she walk around the field? Show or explain your work.
Guiding Questions
Problem 2
Convert the following mixed numbers to fractions greater than 1. Show or explain your work.
a. $${3{1\over2}}$$
b. $${4{1\over4}}$$
c. $${5{3\over5}}$$
Guiding Questions
References
Grade 4 Mathematics > Module 5 > Topic E > Lesson 25 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
Ben wrote a mixed number as a fraction $${7{1\over3}}$$. Here is his work:
| $$7\frac{1}{3}= 7 + \frac{1}{3}$$ | (Step 1) |
| $$=\left(7\times\frac{3}{3}\right)+\frac{1}{3}$$ | (Step 2) |
| $$=\frac{21}{3}+\frac{1}{3}$$ | (Step 3) |
| $${={22\over3}}$$ | (Step 4) |
Explain what Ben did in each step.
Guiding Questions
References
Writing a Mixed Number as an Equivalent Fraction, accessed on July 18, 2018, 9:50 a.m., is licensed by Illustrative Mathematics under either the CC BY 4.0 or CC BY-NC-SA 4.0. For further information, contact Illustrative Mathematics.
Modified by Fishtank Learning, Inc.Problem Set & Homework
Discussion of Problem Set
- Did you use the same strategies or different strategies to solve throughout the Problem Set?
- How was the work from previous lessons helpful in converting from a mixed number to a fraction greater than 1?
- How does the number line help to show the conversion from a mixed number to a fraction greater than 1?
- How was #3 related to today’s work?
- What mistake did Simone make in #5? What is the correct equivalent fraction? How do you know?
Target Task
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Convert each mixed number to a fraction greater than 1. Show or explain your work.
1. $${3{1\over4}}$$
2. $${2{3\over5}}$$
3. $${4{2\over9}}$$
References
Grade 4 Mathematics > Module 5 > Topic E > Lesson 25 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.Mastery Response
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Additional Practice
Unit Practice
With Fishtank Plus you can access our Daily Word Problem Practice and our content-aligned Fluency Activities created to help students strengthen their application and fluency skills.
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