## 2.NBT.A.3

## Read and write numbers to 1000 using base-ten numerals, number names, and expanded form.

20 Lesson(s)

#### The big idea of this lesson is that the base-ten number system uses models to show numbers. The ones digit represents how many ones, and the tens digit represents how many groups of ten.

#### Students take their understanding of place value to the next level when they compare numbers written in expanded form.

Big Idea:

#### This lesson addresses the foundational skill of place value through modeling.

#### Students use place value vocabulary to write excellent mathematical explanations about why a comparison statement is true or false.

#### The Common Core standard is that students understand that the numbers 100, 200, etc. represent so many groups of 100.

Big Idea:

#### Students can get a picture of how big 1,000 is as they build and compare 3-digit numbers.

#### Identifying the place value of numbers is an important skill for second grade. Using the Japanese names for numbers allows for a review of place value identification.

#### Understanding numbers above 100 and the patterns that are created will help students build a stronger understanding of larger numbers.

Big Idea: