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

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)

### 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)

### Take Time for Tens: Act One

3rd Grade Math »
Unit: Place Value Practice

3rd Grade Math »
Unit: Place Value Practice

### Multi-Digit Subtraction

5th Grade Math »
Unit: Targeted Skills Interventions

5th Grade Math »
Unit: Targeted Skills Interventions

### 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

Common Core Math

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### HS Algebra

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### HS Geometry

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### Ninth and Tenth Grade

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### First grade

### Second grade

### Third Grade

### Fourth grade

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### Middle School

Kindergarten

First Grade

Second Grade

Third Grade

Fourth Grade

Fifth Grade

Sixth Grade

Seventh Grade

HS Number & Quantity

HS Algebra

HS Functions

HS Geometry

Kindergarten

First Grade

Second Grade

Third Grade

Fourth Grade

Fifth Grade

Sixth Grade

Seventh Grade

Eighth Grade

Ninth and Tenth Grade

Kindergarten

First grade

Second grade

Third Grade

Fourth grade

Fifth grade

Middle School