Unit 7, Lesson 9
Problemas sobre perímetro
Grado 3
Preparation
Lesson Purpose
The purpose of this lesson is for students to find unknown side lengths given the perimeter of a shape and solve problems involving perimeter.
Lesson Narrative
In previous lessons, students learned how to find the perimeter of shapes given all sides lengths or some side lengths. In this lesson, students use their understanding of perimeter to find missing side lengths when given the perimeter. Then students solve problems in situations that involve perimeter. This lesson prepares students to think carefully about the difference between perimeter and area, which will be addressed in subsequent lessons.
- Engagement
- MLR8
- Explain (orally) strategies for calculating an unknown side length given the perimeter of a shape.
- Explain (orally) strategies for solving word problems involving perimeter.
- Resolvamos problemas sobre perímetro.
Required Preparation
None
Teacher Reflection Questions
How are students working toward multiplication and division fluency while solving perimeter problems?
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