Lesson objective: Represent numbers in expanded notation, base ten numerals, number names, and base 10 representation.

This lesson helps to build fluency in recognizing and writing different representations of the same number. This work develops students' understanding that a number can be represented in many different ways but each representation is equivalent.

Students engage in Mathematical Practice 6 (attend to precision) as they use clear definitions and vocabulary to discuss the different ways to represent numbers and still maintain equivalent values.

**Key vocabulary:**

- base 10 numeral
- base 10 notation
- expanded notation
- equivalency
- number name

**Special materials needed:**

- pencil and paper
- base 10 blocks
- place value chart