## 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
Tucson, AZ
Environment: Urban

Big Idea:

Standards:

Favorites (15)

Resources (12)

Reflections (1)

### Colossal Fossils

3rd Grade Math » Unit: Rounding
3rd Grade Math » Unit: Rounding
Tucson, AZ
Environment: Urban

Big Idea:

#### Read about interesting fossils while practicing this important math skill!

Standards:

Favorites (30)

Resources (19)

Reflections (1)

3rd Grade Math » Unit: Rounding
Tucson, AZ
Environment: Urban

Big Idea:

Standards:

Favorites (21)

Resources (22)

Reflections (1)

### Rounding - Unit Assessment

3rd Grade Math » Unit: Rounding
3rd Grade Math » Unit: Rounding
Tucson, AZ
Environment: Urban

Big Idea:

#### Careful monitoring of student progress helps refine instruction.

Standards:

Favorites (13)

Resources (16)

Reflections (2)

3rd Grade Math » Unit: Rounding
Tucson, AZ
Environment: Urban

Big Idea:

Standards:

Favorites (14)

Resources (16)

Reflections (1)

### Rounding to the Ten's Place

3rd Grade Math » Unit: Rounding
3rd Grade Math » Unit: Rounding
Tucson, AZ
Environment: Urban

Big Idea:

#### Once students master the concept behind rounding to the closest ten they can apply it to all other rounding!

Standards:

Favorites (42)

Resources (23)

Reflections (3)

3rd Grade Math » Unit: Rounding
Tucson, AZ
Environment: Urban

Big Idea:

#### Students must have a well-developed understanding of place value in order to be able to round to the closest hundred.

Standards:

Favorites (20)

Resources (20)

Reflections (1)

3rd Grade Math » Unit: Rounding
Tucson, AZ
Environment: Urban

Big Idea:

#### The principles behind rounding to the closest ten and hundred are EXACTLY the same whether the number is "small" (867) or "large" (123,867).

Standards:

Favorites (12)

Resources (16)

Reflections (2)

3rd Grade Math » Unit: Subtraction
Phoenix, AZ
Environment: Urban

Big Idea:

Standards:

Favorites (6)

Resources (16)

Reflections (1)

### Addition - Expanded Form

3rd Grade Math » Unit: Addition and Subtraction
3rd Grade Math » Unit: Addition and Subtraction
Tucson, AZ
Environment: Urban

Big Idea:

Standards:

Favorites (13)

Resources (16)

Reflections (1)

### Mental Math with Place Value

3rd Grade Math » Unit: Place Value
3rd Grade Math » Unit: Place Value
Troy, MI
Environment: Suburban

Big Idea:

Standards:

Favorites (12)

Resources (14)

Reflections (1)

### Take Time for Tens: Act One

3rd Grade Math » Unit: Place Value Practice
3rd Grade Math » Unit: Place Value Practice
Tucson, AZ
Environment: Urban

Big Idea:

Standards:

Favorites (11)

Resources (19)

Reflections (1)

### Multi-Digit Subtraction

5th Grade Math » Unit: Targeted Skills Interventions
5th Grade Math » Unit: Targeted Skills Interventions
Grand Rapids, MI
Environment: Urban

Big Idea:

#### Beg, borrow, steal? I think borrowing is best!

Standards:

Favorites (7)

Resources (9)

3rd Grade Math » Unit: Subtraction
Phoenix, AZ
Environment: Urban

Big Idea:

#### Using a number line to subtract across zeros supports students conceptual understanding of crossing decades when subtracting.

Standards:

Favorites (25)

Resources (19)

Reflections (1)

3rd Grade Math » Unit: Place Value
Troy, MI
Environment: Suburban

Big Idea:

Standards:

Favorites (5)

Resources (9)

Reflections (1)
Common Core Math