Unit 9, Lesson 5
Compose and Decompose Numbers within 1,000
Grade 2
Preparation
Lesson Narrative
In previous units, students represented three-digit numbers by composing and decomposing units using base-ten blocks, base-ten diagrams, and equations.
In this lesson, students compose and decompose three-digit numbers using base-ten blocks and other representations that make sense to them. Throughout the lesson, students are encouraged to show and deepen their understanding of place value by composing and decomposing units.
- Action and Expression
None
- Explain (orally) how to compose or decompose units to represent a three-digit number in a different way.
- Match (orally) words, numerals, expressions, and diagrams that represent the same three-digit number.
- Let’s represent numbers in many different ways.
Required Preparation
None
Suggested Centers
NoneTeacher Reflection Questions
In this section, students are working to develop fluency when adding and subtracting within 100. How does the work of the lesson help deepen students' understanding of place value? How will the work of this lesson help students become more fluent when adding and subtracting within 100?