Curriculum  /  Math  /  2nd Grade  /  Unit 5: Adding and Subtracting Within 1,000  /  Lesson 9

Adding and Subtracting Within 1,000

Lesson 9

Math

Unit 5

2nd Grade

Lesson 9 of 25

Objective

Use expanded form to add within 1,000.

Student-Facing

I can use expanded form to add within 1,000. 

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. Decompose multi-digit numbers into their respective hundreds, tens, and ones in expanded form.
  2. Add like units together to add to find the total of respective hundreds, tens, and ones. 
  3. Represent expanded form addition stacked vertically by place value and add vertical like units together.
  4. Combine the overall totals of hundreds, tens, and ones to find the total. 

Tips for Teachers

  • Making direct connections to concrete models or place value drawings can support students as they move towards more abstract thinking of adding multi-digit numbers within 1,000.
  • Using expanded form notation for addition can be represented by adding same place value units together or by aligning the addends in expanded form vertically and then adding as you would similarly to the standard algorithm. In this lesson students should be exposed to both.

Warm Up

5-10 minutes

Unlock warm-up activities that help you engage every student and prepare them for the day’s lesson with a Fishtank Plus subscription.

Anchor Tasks

15-25 minutes

Problem 1

Jin had the following base ten blocks and wanted to record how she added using numbers. Finish Jin's thinking below. 

300 + 200 = 500

40 +       =       

      + 1 =      

500 +       +       =       

Purpose

Create a free account or sign in to access the Purpose for this Anchor Problem.

Upgrade to Fishtank Plus to view Facilitation Guidance and Sample Student Response for this Anchor Task.

Problem 2

Mia solved by thinking of expanded form. Some of her work is shown below.

a.   Complete Mia's thinking.

357 + 190 = ____

$$\begin{array}{crcrcrcc} &300 &+ &50 &+ &7 &&&\\ + \ \ \ &100 &+ &90 &+ &0 &&&\\ \hline &400 &+ &\_\_\_ &+ &\_\_\_ &= &\_\_\_ \end{array}$$

b.   Solve using Mia's thinking:

435 + 273 = _____

Purpose

Create a free account or sign in to access the Purpose for this Anchor Problem.

Upgrade to Fishtank Plus to view Facilitation Guidance and Sample Student Response for this Anchor Task.

Problem 3

Solve with expanded form thinking. Show your work. 

a.   325 + 284 = _____

b.   462 + 310 = _____

c.   105 + 529 = _____

d.   353 + 387 = _____

Purpose

Create a free account or sign in to access the Purpose for this Anchor Problem.

Upgrade to Fishtank Plus to view Facilitation Guidance and Sample Student Response for this Anchor Task.

Problem Set

15-20 minutes

Target Task

5-10 minutes

Use expanded form notation to add. 

a.   125 + 94 = _____

b.   546 + 231 = _____

c.   640 + 352 = _____

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

Relate addition with place value drawings to algorithms in situations with up to two compositions of a new ten or hundred.

Lesson 10
icon/arrow/right/large

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

Request a Demo

See all of the features of Fishtank in action and begin the conversation about adoption.

Learn more about Fishtank Learning School Adoption.

Contact Information

School Information

What courses are you interested in?

ELA

Math

Are you interested in onboarding professional learning for your teachers and instructional leaders?

Yes

No

Any other information you would like to provide about your school?

We Handle Materials So You Can Focus on Students

We Handle Materials So You Can Focus on Students

We've got you covered with rigorous, relevant, and adaptable math lesson plans for free