Unit 6, Lesson 6
Compose and Decompose Shapes
Grade 2
Preparation
Lesson Purpose
The purpose of this lesson is for students to compose shapes and to recognize shapes that are made up of equal-size shapes.
Lesson Narrative
In previous grades, students learned that shapes can be made up of other shapes. In previous lessons, students identified shapes, based on the numbers of sides and corners, and drew shapes having specific attributes.
In this lesson, students continue to practice identifying shapes, based on their attributes, using the vocabulary from previous lessons. They also extend their understanding of the attributes of shapes by considering how a shape may be composed of other shapes. In particular, this lesson focuses on composing a shape from the same equal-size shapes. This lesson prepares students for partitioning shapes into equal-size pieces and naming equal-size pieces in upcoming lessons.
- Representation
- MLR8
- Compare and contrast (orally) compositions of shapes that form the same given shape.
- Create a shape composed of equal-size smaller shapes and identify (orally and in writing) the shapes.
- Let’s make shapes with equal-size smaller shapes.
Required Preparation
None
Teacher Reflection Questions
In the first section, students spent time describing and drawing shapes with given attributes. How did this work help prepare them for composing and decomposing shapes in this lesson?
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