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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 10â90 (e.g., 9 Ã 80, 5 Ã 60) using strategies based on place value and properties of operations.

Initial Informal Assessments

3rd Grade Math

Â» Unit:

1st Week: Getting to Know Each Other Through Graphs

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

Colossal Fossils

3rd Grade Math

Â» Unit:

Rounding

Big Idea:Read about interesting fossils while practicing this important math skill!

Stories in Stone (Rounding to the Tens Place)

3rd Grade Math

Â» Unit:

Rounding

Big Idea:Place value is the bedrock that everything is built on!

Rounding - Unit Assessment

3rd Grade Math

Â» Unit:

Rounding

Big Idea:Careful monitoring of student progress helps refine instruction.

A Trip Through Time (Word Problems, Including Rounding)

3rd Grade Math

Â» Unit:

Rounding

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

Rounding to the Ten's Place

3rd Grade Math

Â» Unit:

Rounding

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

Rounding to the Hundred's Place

3rd Grade Math

Â» Unit:

Rounding

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

Rounding to the Closest Ten Above One Thousand

3rd Grade Math

Â» Unit:

Rounding

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).

Pumpkin Problems: Estimates to Actuals

3rd Grade Math

Â» Unit:

Subtraction

Big Idea:Critical to mathematical success is developing the sophistication of studentsâ strategies simultaneously with the teaching and application of key mathematical knowledge.

Addition - Expanded Form

3rd Grade Math

Â» Unit:

Addition and Subtraction

Big Idea:Expanded form can help clear up confusion about regrouping.

Mental Math with Place Value

3rd Grade Math

Â» Unit:

Place Value

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.

Multi-Digit Subtraction

5th Grade Math

Â» Unit:

Targeted Skills Interventions

Big Idea:Beg, borrow, steal? I think borrowing is best!

Take Time for Tens: Act One

3rd Grade Math

Â» Unit:

Place Value Practice

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

Adding 3 Digits to 3 Digits Using Expanded Form

3rd Grade Math

Â» Unit:

Place Value

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.

Subtraction - Expanded Form

3rd Grade Math

Â» Unit:

Addition and Subtraction

Big Idea:Expanded form can help clear up confusion about regrouping.

3.NBT.A.1

Use place value understanding to round whole numbers to the nearest 10 or 100.

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.

3.NBT.A.3

Multiply one-digit whole numbers by multiples of 10 in the range 10â90 (e.g., 9 Ã 80, 5 Ã 60) using strategies based on place value and properties of operations.