Place Value with Decimals

Lesson 12

Math

Unit 1

5th Grade

Lesson 12 of 13

Objective


Use place value understanding to round decimals to the nearest whole.

Common Core Standards


Core Standards

  • 5.NBT.A.4 — Use place value understanding to round decimals to any place.

Foundational Standards

  • 3.NBT.A.1
  • 4.NBT.A.3

Criteria for Success


  1. Round decimals to the nearest ten, hundred, thousand, etc., using a number line. 
  2. Round decimals to the nearest whole using a number line.
  3. Understand that, by convention, numbers at the midpoint between two benchmarks are rounded to the greater of the two benchmarks. 
  4. Use the $${\approx }$$ symbol to record estimations. 
  5. Understand the advantages and disadvantages of rounding to various places (e.g., rounding to a larger place makes it easier to operate with that number, rounding to a smaller place is closer to the actual value, etc.) depending on the situation.

Tips for Teachers


  • While students haven’t rounded decimals to the nearest ten hundred, thousand, etc., they have rounded whole numbers to those places. Thus, Criteria for Success #1 is essentially spiral content, which students should be able to access easily. 
  • You’ll want to avoid using terms like “round up” and “round down,” since these terms can be confusing for students. “Rounding up” a number results in a change in the value of the place to which you’re rounding, where “rounding down” does not. Often students will change the value mistakenly as a result.
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Anchor Tasks

25-30 minutes


Problem 1

Is 7.6 closer to 7 or closer to 8? Plot 7 and 8 on the two outermost spots on the number line below. Then plot 7.6 to prove your answer.

Guiding Questions

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Student Response

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References

Illustrative Mathematics Rounding on the Number Line

Rounding on the Number Line, accessed on Sept. 11, 2017, 8:36 p.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 2

Round each of the following numbers to the nearest hundred, ten, and whole. Record your answer with the “$$\approx$$” symbol

a.   99.248

b.   314.5

c.   24.93

Guiding Questions

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Student Response

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Problem Set

15-20 minutes


Discussion of Problem Set

  • Look at #1. Which value is closest to the original number? Is that the case for #1b and #1c, too? Why or why not? 
  • Look at #2. What is your list? How did you come up with it?
  • Look at #3a. If you were to take the rounded whole value and round that number to the nearest ten, what would you get? Why would you get a different value than when you rounded the original number to the nearest ten? 
  • Look at #4. To what was 4.97 rounded? Why shouldn’t the number have been rounded? 

Target Task

5-10 minutes


Problem 1

Round each of the following to the nearest whole.

a.   8.546 $${{\approx}}$$ ___________

b.   11.499 $${{\approx}}$$ ___________

Student Response

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Problem 2

Round the following to the nearest hundred, ten, and one. 

149.075

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

Use place value understanding to round decimals to any place.

Lesson 13
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Lesson Map

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

Topic A: Place Value with Whole Numbers

Topic B: Place Value with Decimals

Topic C: Reading, Writing, Comparing, and Rounding Decimals

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