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
Jennifer Valentine
Tucson, AZ
Environment: Urban
 
Big Idea:

Get to know your students' learning personalities as you observe them on this informal assessment.

 
Favorites (15)
 
Resources (12)
 
Reflections (1)
screen shot 2014 06 04 at 11 20 43 pm
   

Colossal Fossils

3rd Grade Math » Unit: Rounding
3rd Grade Math » Unit: Rounding
Jennifer Valentine
Tucson, AZ
Environment: Urban
 
Big Idea:

Read about interesting fossils while practicing this important math skill!

 
Favorites (30)
 
Resources (19)
 
Reflections (1)
xiphactinusdb
   

Stories in Stone (Rounding to the Tens Place)

3rd Grade Math » Unit: Rounding
3rd Grade Math » Unit: Rounding
Jennifer Valentine
Tucson, AZ
Environment: Urban
 
Big Idea:

Place value is the bedrock that everything is built on!

 
Favorites (19)
 
Resources (22)
 
Reflections (1)
cap reef lesson image
   

Rounding - Unit Assessment

3rd Grade Math » Unit: Rounding
3rd Grade Math » Unit: Rounding
Jennifer Valentine
Tucson, AZ
Environment: Urban
 
Big Idea:

Careful monitoring of student progress helps refine instruction.

 
Favorites (13)
 
Resources (16)
 
Reflections (2)
i am round fuzzy guy on assessment doc lesson image temp
   
3rd Grade Math » Unit: Rounding
Jennifer Valentine
Tucson, AZ
Environment: Urban
 
Big Idea:

A high interest topic can help make large numbers seem less intimidating.

 
Favorites (14)
 
Resources (16)
 
Reflections (1)
lesson image a trip through time
   

Rounding to the Ten's Place

3rd Grade Math » Unit: Rounding
3rd Grade Math » Unit: Rounding
Jennifer Valentine
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!

 
Favorites (41)
 
Resources (23)
 
Reflections (3)
child with pencil writign
   

Rounding to the Hundred's Place

3rd Grade Math » Unit: Rounding
3rd Grade Math » Unit: Rounding
Jennifer Valentine
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.

 
Favorites (20)
 
Resources (20)
 
Reflections (1)
shutterstock 127559705
   

Rounding to the Closest Ten Above One Thousand

3rd Grade Math » Unit: Rounding
3rd Grade Math » Unit: Rounding
Jennifer Valentine
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).

 
Favorites (12)
 
Resources (16)
 
Reflections (2)
shutterstock 105805922
   

Pumpkin Problems: Estimates to Actuals

3rd Grade Math » Unit: Subtraction
3rd Grade Math » Unit: Subtraction
Diane Siekmann
Phoenix, AZ
Environment: Urban
 
Big Idea:

Critical to mathematical success is developing the sophistication of students’ strategies simultaneously with the teaching and application of key mathematical knowledge.

 
Favorites (6)
 
Resources (16)
 
Reflections (1)
pumpkin estimation and
   

Addition - Expanded Form

3rd Grade Math » Unit: Addition and Subtraction
3rd Grade Math » Unit: Addition and Subtraction
Jennifer Valentine
Tucson, AZ
Environment: Urban
 
Big Idea:

Expanded form can help clear up confusion about regrouping.

Standards:
 
Favorites (13)
 
Resources (16)
 
Reflections (1)
temp lesson image expanded form subtraction xtra support 8470
   

Mental Math with Place Value

3rd Grade Math » Unit: Place Value
3rd Grade Math » Unit: Place Value
Michelle Marcus
Troy, MI
Environment: Suburban
 
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)
squirrel with a headache
   

Take Time for Tens: Act One

3rd Grade Math » Unit: Place Value Practice
3rd Grade Math » Unit: Place Value Practice
Jennifer Valentine
Tucson, AZ
Environment: Urban
 
Big Idea:

Students must have a solid understanding of 2 digit addition w/regrouping before moving on to 3 digit addition!

 
Favorites (10)
 
Resources (19)
 
Reflections (1)
jose lesson image taking time tens 6792
   

Multi-Digit Subtraction

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

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

 
Favorites (6)
 
Resources (9)
subtraction
   

Subtract Across Zero Using Number Lines

3rd Grade Math » Unit: Subtraction
3rd Grade Math » Unit: Subtraction
Diane Siekmann
Phoenix, AZ
Environment: Urban
 
Big Idea:

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

 
Favorites (25)
 
Resources (19)
 
Reflections (1)
imgres 1
   

Adding 3 Digits to 3 Digits Using Expanded Form

3rd Grade Math » Unit: Place Value
3rd Grade Math » Unit: Place Value
Michelle Marcus
Troy, MI
Environment: Suburban
 
Big Idea:

Decomposing a large number into its expanded form is helpful in strengthening one's mental math ability. This lesson is designed to give the students practice in using this important strategy.

 
Favorites (5)
 
Resources (9)
 
Reflections (1)
expanded form
Common Core Math
 
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