Place Value, Rounding, Addition, and Subtraction

Lesson 11

Math

Unit 1

4th Grade

Lesson 11 of 19

Objective


Round multi-digit numbers to any place.

Common Core Standards


Core Standards

  • 4.NBT.A.3 — Use place value understanding to round multi-digit whole numbers to any place.

Foundational Standards

  • 3.NBT.A.1

Criteria for Success


  1. Round multi-digit numbers to any place using a number line to justify reasoning. 
  2. Know that, by convention, a number at the midpoint between two benchmarks is rounded to the larger of the two benchmarks. 
  3. Use the $$\approx$$ symbol to record estimations.
  4. Understand the advantages and disadvantages of rounding a value to various places, including the precision of rounding a number to a smaller place (MP.6) and ease of working/operating when rounding a number to a larger place.

Tips for Teachers


Before the Problem Set, you could have students play "Becca's Battle" from Building Conceptual Understanding and Fluency Through Games by the Public Schools of North Carolina.

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Anchor Tasks

25-30 minutes


Problem 1

Is 4,175 closer to 4,100 or 4,200? Plot 4,100 and 4,200 on the two outermost spots on the number line below. Then plot 4,175 to prove your answer.

Guiding Questions

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Student Response

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Problem 2

a.   The number 96,381 lies between 96,380 and 96,390 on the number line. Label all the other tick marks between 96,380 and 96,390. Is 96,381 closer to 96,380 or 96,390 on the number line?

b.   Which hundred is 96,381 closest to on the number line? Plot 96,300 and 96,400 on the two outermost spots on the number line below. Then plot 96,381 to prove your answer.

c.   Which thousand is 96,381 closest to on the number line? Plot 96,000 and 97,000 on the two outermost spots on the number line below. Then plot 96,381 to prove your answer.

d.   Which ten thousand is 96,381 closest to? Show or explain your thinking.

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 3

a.   Solve. 

  1. 147,951 rounded to the nearest million is ________________.
  2. 147,951 rounded to the nearest hundred thousand is ________________.
  3. 147,951 rounded to the nearest ten thousand is ________________.
  4. 147,951 rounded to the nearest thousand is ________________.
  5. 147,951 rounded to the nearest hundred is ________________.
  6. 147,951 rounded to the nearest ten is ________________.

b.   What do you notice about the rounded values in Part (a)? What do you wonder?  

Guiding Questions

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Student Response

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References

EngageNY Mathematics Grade 4 Mathematics > Module 1 > Topic C > Lesson 9Concept Development

Grade 4 Mathematics > Module 1 > Topic C > Lesson 9 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 Set

15-20 minutes


Discussion of Problem Set

  • Look at #3b. How did you round this number to the nearest hundred thousand? What made it more challenging to do so?
  • Look at #5a. How did you round this number to the nearest thousand? What made it more challenging to do so?
  • Look at #8. What happened when you rounded the same value to various places? Which estimate is the most precise?
  • Tell your partner your steps for rounding a number. Which step is most difficult for you? Why? 
  • What makes 5 special in rounding?
  • How does the number line help you round numbers? Is there another way you prefer? Why?
  • What is the purpose of rounding?
  • When might we use rounding or estimation?
  • What are the advantages and disadvantages of rounding to a large place? A small place?

Target Task

5-10 minutes


Problem 1

Round 39,150 to the given place:

a.   Hundred __________________ 

b.   Thousand __________________

c.   Ten thousand __________________

d.   Hundred thousand __________________

Student Response

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Problem 2

A veterinarian makes $1,765 in one week. Round the amount of money a veterinarian makes to the nearest hundred and thousand. Which value is more precise? Explain your thinking.

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

Round multi-digit numbers to any place in more complex cases, including those involving real-world contexts and/or assessing the reasonableness of that estimate.

Lesson 12
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Lesson Map

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

Topic A: Place Value of Multi-Digit Whole Numbers

Topic B: Reading, Writing, and Comparing Multi-Digit Whole Numbers

Topic C: Rounding Multi-Digit Whole Numbers

Topic D: Multi-Digit Whole-Number Addition and Subtraction

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