Unit 7, Lesson 8
Compose Tens and Hundreds to Add
Grade 2
Preparation
Lesson Purpose
The purpose of this lesson is for students to add within 1,000, using place value-based strategies, by composing both a ten and a hundred.
Lesson Narrative
In previous lessons, students related composing a ten and a hundred when adding within 1,000. They found sums that required composing a greater unit when adding by place. Throughout this lesson, the addends in each expression encourage students to consider adding by place. Both activities invite students to make sense of methods based on adding by place, and to use the method that makes the most sense to them. Monitor for the different methods students use and how they use their understanding of place value to add and to make sense of others’ work (MP3, MP7).
- Action and Expression
None
- Compare and contrast (orally) recording methods for adding within 1,000.
- Explain (orally) strategies for adding two-digit and three-digit numbers, including composing two units.
- Let’s compose tens and hundreds to add.
Required Preparation
None
Teacher Reflection Questions
Today, for the first time, students composed both a ten and a hundred when adding a two-digit number and a three-digit number. Where did you observe students generalizing their understanding of place value and composing greater units as they found the sums? How will you support students who prefer other methods to make sense of composing units when adding by place as they continue this work in upcoming lessons?
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