Curriculum  /  Math  /  2nd Grade  /  Unit 5: Adding and Subtracting Within 1,000  /  Lesson 6

Adding and Subtracting Within 1,000

Lesson 6

Math

Unit 5

2nd Grade

Lesson 6 of 25

Objective

Use concrete manipulatives to add within 1,000 with up to two compositions.

Student-Facing

I can use concrete manipulatives to add within 1,000 and make new hundreds and tens.

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.1
  • 2.NBT.A.2

Criteria for Success

  1. Build three-digit numbers to represent hundreds, tens, and ones for 2 addends in the problem. 
  2. Combine like units together to add. When there are more than nine of a given unit, exchange 10 units for one of the next larger unit (i.e., 10 ones for 1 ten or 10 tens for 1 hundred).
  3. Recognize and explain when a new unit is made in given addition situations.

Tips for Teachers

Lesson Materials

  • Base ten blocks (10 hundreds, 18 tens, 18 ones per student)
  • Hundreds place value chart (1 per student) — Work Mat Template — These should be laminated or in sheet protectors to reuse

Warm Up

5-10 minutes

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Anchor Tasks

15-25 minutes

Problem 1

a.   Use a place value chart work mat and base ten blocks to solve. 

174 + 158 = _____

b.   Did you make a new ten? Explain your thinking.

c.   Did you make a new hundred? Explain your thinking.

Purpose

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Problem 2

Use your hundreds place value chart work mat and base ten blocks to solve. Bundle a new ten or hundred when needed. 

a.   558 + 163 = _____

b.   175 + 325 = _____

c.   608 + 194 = _____

d.   713 + 97 = _____

Purpose

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Problem 3

a.   Use base ten blocks to find the total.

  1. 133 + 467 = _____

  2. 284 + 216 = _____

  3. 365 + 135 = _____

  4. 359 + 241 = _____

b.   What pattern did you notice?

Purpose

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Problem Set

15-20 minutes

Target Task

5-10 minutes

Use a place value chart work mat and base ten blocks to solve. Record your answers. 

a.   436 + 177 = _____

  1. Did you make a new ten?

  2. Did you make a new hundred?

b.   245 + 157 = _____

  1. Did you make a new ten?

  2. Did you make a new hundred?

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 add within 1,000 with up to one composition of a new unit.

Lesson 7
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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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