Unit 1, Lesson 9
Measure Figures Made from Prisms
Grade 5
Preparation
Lesson Purpose
The purpose of this lesson is for students to find the volume of a figure composed of two non-overlapping right rectangular prisms by adding the volumes of the non-overlapping parts.
Lesson Narrative
In the previous lesson, students worked with figures that showed the unit cubes, providing them the opportunity to visualize the number of unit cubes and find volume in a variety of ways. In this lesson, the figures composed of two non-overlapping right rectangular prisms do not show the individual cubes. This encourages students to apply the volume formulas and make connections between expressions and the way the figures can be decomposed. Given an expression and a solid figure composed of two rectangular prisms, students determine how to decompose the figure to match the given expression (MP2, MP7).
- Representation
- MLR7
- Explain (orally) strategies for calculating the volume of a figure composed of rectangular prisms in which unit cubes are not visible.
- Interpret (orally and in writing) an expression that represents the volume of a figure composed of rectangular prisms.
- Let’s find the volumes of more figures.
Required Preparation
None
Teacher Reflection Questions
What connections did students make between the different strategies shared? What questions did you ask to help make the connections more visible?
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