Lesson 5
Expanded Form of Numbers
Lesson Purpose
Lesson Narrative
In previous lessons, students represented threedigit numbers by recording how many of each unit (for example, 357 as 3 hundreds, 5 tens, 7 ones). They also connected representations of a number using the fewest number of baseten blocks to the value of the digits in threedigit numbers.
In this lesson, students extend their understanding of ways to express the value of the digits in threedigit numbers to include expanded form. They represent threedigit numbers as the sum of the value of each digit (for example, \(357 = 300 + 50 + 7\)).
 Action and Expression
 MLR8
Learning Goals
Teacher Facing
 Read, write, and represent threedigit numbers using baseten numerals and expanded form.
Student Facing
 Let’s represent threedigit numbers as a sum of the value of each digit.
Required Materials
Materials to Gather
Required Preparation
Activity 2:
 Each group of 2 needs 3 number cubes.
Lesson Timeline
Warmup  10 min 
Activity 1  20 min 
Activity 2  15 min 
Lesson Synthesis  10 min 
Cooldown  5 min 
Teacher Reflection Questions
As students represented numbers in expanded form and as threedigit numbers, what evidence did you see that they understand place value?
Suggested Centers
 Greatest of Them All (1–5), Stage 1: Twodigit Numbers (Supporting)
 Mystery Number (1–4), Stage 1: Twodigit Numbers (Supporting)
Print Formatted Materials
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Additional Resources
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