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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.

Colossal Fossils

3rd Grade Math

» 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

» Unit:

Rounding

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

Rounding - Unit Assessment

3rd Grade Math

» Unit:

Rounding

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

A Trip Through Time (Word Problems, Including Rounding)

3rd Grade Math

» 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

» 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

» 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

» 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).

Take Time for Tens: Act One

3rd Grade Math

» 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!

Place Value to Thousands

3rd Grade Math

» Unit:

Review for Testing

Big Idea:This lesson addresses the foundational skill of place value through modeling.

Jeopardy Review

3rd Grade Math

» Unit:

More Problem Solving Practice

Big Idea:Games make problem solving fun and exciting.

Math Scavenger Hunt (Days 1 - 5)

3rd Grade Math

» Unit:

Review for Testing

Big Idea:Students demonstrate mathematical thinking with real world examples.

Rounding to Check Accuracy

3rd Grade Math

» Unit:

Place Value

Big Idea:In order to approximate a total, or to help check the reasonableness of an answer, students need to be able to round to the nearest 10 or 100. Check out this lesson for a fun game that gives them practice rounding, adding, and subtracting.

Creating a Summer Review Packet (Day 1)

3rd Grade Math

» Unit:

Review Activities

Big Idea:Students that can write their own story problems, and create math situations that require thought and perseverance to solve, are students that understand. This engaging activity reviews all of the third grade concepts and creates a review packet as well!

Happy Hundreds

3rd Grade Math

» Unit:

Place Value Practice

Big Idea:Working with concrete representations (blocks) helps students understand the abstraction of regrouping.

The Next Decade

3rd Grade Math

» Unit:

Place Value

Big Idea:Students need to understand what a rounded number represents, and how that representation may be for several numbers. As the students solve various situations in this lesson, they come to know that a rounded number represents 9 different values.

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 10–90 (e.g., 9 × 80, 5 × 60) using strategies based on place value and properties of operations.