Curriculum  /  Math  /  2nd Grade  /  Unit 5: Adding and Subtracting Within 1,000  /  Lesson 17

Adding and Subtracting Within 1,000

Lesson 17

Math

Unit 5

2nd Grade

Lesson 17 of 25

Objective

Use place value drawings to subtract within 1,000 with up to one decomposition.

Student-Facing

I can use place value drawing to subtract with up to one decomposition and check my subtraction with addition. 

Common Core Standards

Core Standards

  • 2.NBT.B.7 — Add and subtract within 1000, using concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship between addition and subtraction; relate the strategy to a written method. Understand that in adding or subtracting three-digit numbers, one adds or subtracts hundreds and hundreds, tens and tens, ones and ones; and sometimes it is necessary to compose or decompose tens or hundreds.

Foundational Standards

  • 1.NBT.B.2
  • 2.NBT.A.2
  • 1.OA.A.1

Criteria for Success

  1. Draw three-digit numbers with base ten block drawings to represent hundreds, tens, and ones for the minuend in the problem. 
  2. If there are not enough tens or ones to subtract, redraw the whole by decomposing a hundred into 10 tens or a ten into 10 ones and remodel the whole number as a sum of hundreds, more than 10 tens, and/or more than 10 ones to subtract. 
  3. Subtract units by place value to find the difference.
  4. Check work by adding the solution and the part that was subtracted to get the whole. 

Tips for Teachers

To support their work on checking their solution, use a number bond as a visual to show the part-part-whole relationship. 

Lesson Materials

  • Hundreds place value chart (1 per student) — Work Mat Template — These should be laminated or in sheet protectors to reuse
  • Sheet protectors (1 per student)
  • Dry erase marker (1 per student)

Warm Up

5-10 minutes

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Anchor Tasks

15-25 minutes

Problem 1

Draw base ten blocks to solve. Record your answers and show how you check your solution.

a.   147 - 64 = _____

Check 

b.   560 - 432 = _____

Check 

c.   378 - 145 = _____

Check 

d.   618 - 324 = _____

Check 

Purpose

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Problem 2

Subtract to find the difference. Then add to check your solution. 

a.   180 - 72 = _____ 

Solve                                                                                Check

 

b.   495 - 261 = _____

Solve                                                                                Check

c.   249 - 82 = _____

Solve                                                                                Check

d.   185 + _____ = 505

Solve                                                                                Check

Purpose

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Problem Set

15-20 minutes

Target Task

5-10 minutes

Model your subtraction using a place value drawing.  Record your answers and show how you check your solution.  

a.   594 - 73 = _____

b.   837 - 170  = _____

c.   450 - 239 = _____

Student Response

Additional Practice

Daily Word Problems, Warm Ups, and Center 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

Next

Use place value drawings to subtract within 1,000 with up to two decompositions.

Lesson 18
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Lesson Map

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

Topic A: Adding with Mental Strategies

Topic B: Adding within 1,000

Topic C: Subtracting with Mental Strategies

Topic D: Subtracting within 1,000

Topic E: Story Problems and Explaining Addition and Subtracting Thinking

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