Rounding, Addition, and Subtraction

Lesson 12

Math

Unit 1

3rd Grade

Lesson 12 of 14

Objective


Subtract numbers with multiple decompositions within 1,000.

Common Core Standards


Core Standards

  • 3.NBT.A.2 — Fluently add and subtract within 1000 using strategies and algorithms based on place value, properties of operations, and/or the relationship between addition and subtraction.

Foundational Standards

  • 2.NBT.B.5

Criteria for Success


  1. Subtract three-digit numbers with multiple decompositions.
  2. Solve one-step word problems involving three-digit subtraction with multiple decompositions.

Tips for Teachers


  • Students have solved one-step word problems involving subtraction in previous grade levels (1.OA.1, 2.OA.1), just not yet with whole numbers of this magnitude. So, the intention of the word problems in this lesson is to have students solve contextual problems that involve computations expected of this grade level (3.NBT.2) as well as prepare students to solve two-step word problems involving addition and subtraction later in the unit, and eventually all four operations in Units 2 and 3 (3.OA.8).
  • Before the Problem Set, you could have students play "Get to Zero" from YouCubed.

Lesson Materials

  • Optional: Paper base ten blocks (hundreds, tens, ones) (5 per student or small group) — Students might not need these depending on their reliance on concrete materials. See Anchor Task 1 Notes to see how to prepare this material before the lesson.
  • Thousands place value chart (1 per student) — Students might need more or less depending on their reliance on this tool.
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Anchor Tasks


Problem 1

Mr. Silver and Mrs. Ingall printed out some new paper base ten blocks. Now they have 9 hundreds, 2 tens, and 4 ones. Mrs. Ingall wants to represent the number 356. What will the value of the remaining paper base ten blocks be?

Guiding Questions

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Problem 2

Estimate. Then solve.

a.   521 − 53 = _____

b.   298 + $$\square$$ = 900

c.   772 = 1,000 − _____

Guiding Questions

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Problem 3

Jahfree had $703 in his bank account. He bought a new couch. Now, he has $124 left in his bank account. How much money did Jahfree spend on the couch?

Guiding Questions

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References

EngageNY Mathematics Grade 3 Mathematics > Module 2 > Topic E > Lesson 19Concept Development

Grade 3 Mathematics > Module 2 > Topic E > Lesson 19 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


Answer Keys

Unlock the answer keys for this lesson's problem set and extra practice problems to save time and support student learning.

Discussion of Problem Set

  • What is the relationship between #1(a), 1(b), and 1(c)?
  • Look at #3. Did anyone solve without using subtraction? Explain. 
  • Look at #5. How did you solve?
  • Did you use any mental strategies? For which problems? Why?

Target Task


Problem 1

Solve. Show or explain your work.

a.   $$916 - 538 = $$ _____

b.   _____ $$= 1,000 - 457$$

c.   $$536 = 602-$$ _____

Student Response

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Problem 2

The farmer’s chickens laid 178 fewer eggs this week than last week. The chickens laid 725 eggs last week. How many eggs did the chickens lay this week?

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.

Extra Practice Problems

Answer Keys

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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.

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Lesson 11

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Lesson 13

Lesson Map

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

Topic A: Foundations of Place Value

Topic B: Rounding to the Nearest Ten and Hundred

Topic C: Addition and Subtraction Within 1,000

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