3.NBT.A.2

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- 3.NBT.A.1Use place value understanding to round whole numbers to the nearest 10 or 100.
- 3.NBT.A.2Fluently add and subtract within 1000 using strategies and algorithms based on place value, properties of operations, and/or the relationship between addition and subtraction.
- 3.NBT.A.3Multiply one-digit whole numbers by multiples of 10 in the range 10–90 (e.g., 9 × 80, 5 × 60) using strategies based on place value and properties of operations.

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## 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.

51 Lesson(s)

### Initial Informal Assessments

3rd Grade Math »
Unit: 1st Week: Getting to Know Each Other Through Graphs

3rd Grade Math »
Unit: 1st Week: Getting to Know Each Other Through Graphs

### Stories in Stone (Rounding to the Tens Place)

3rd Grade Math »
Unit: Rounding

3rd Grade Math »
Unit: Rounding

### A Trip Through Time (Word Problems, Including Rounding)

3rd Grade Math »
Unit: Rounding

3rd Grade Math »
Unit: Rounding

### Rounding to the Closest Ten Above One Thousand

3rd Grade Math »
Unit: Rounding

3rd Grade Math »
Unit: Rounding

### Pumpkin Problems: Estimates to Actuals

3rd Grade Math »
Unit: Subtraction

3rd Grade Math »
Unit: Subtraction

### Addition - Expanded Form

3rd Grade Math »
Unit: Addition and Subtraction

3rd Grade Math »
Unit: Addition and Subtraction

Big Idea:

#### Expanded form can help clear up confusion about regrouping.

Standards:

Favorites
(13)

Resources
(16)

Reflections
(1)

Big Idea:

#### It is imperative that students have a strong understanding of place value in order to complete and communicate any given math task. This lesson invites them to re-explore strategies they have created prior to teaching standard algorithms.

Favorites
(12)

Resources
(14)

Reflections
(1)

### Multi-Digit Subtraction

5th Grade Math »
Unit: Targeted Skills Interventions

5th Grade Math »
Unit: Targeted Skills Interventions

### Take Time for Tens: Act One

3rd Grade Math »
Unit: Place Value Practice

3rd Grade Math »
Unit: Place Value Practice

### Subtract Across Zero Using Number Lines

3rd Grade Math »
Unit: Subtraction

3rd Grade Math »
Unit: Subtraction

### Adding 3 Digits to 3 Digits Using Expanded Form

3rd Grade Math »
Unit: Place Value

3rd Grade Math »
Unit: Place Value

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Kindergarten

First Grade

Second Grade

Third Grade

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HS Number & Quantity

HS Algebra

HS Functions

HS Geometry

Kindergarten

First Grade

Second Grade

Third Grade

Fourth Grade

Fifth Grade

Sixth Grade

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Ninth and Tenth Grade

Kindergarten

First grade

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