Unit 7, Lesson 8
Encontremos el perímetro
Grado 3
Preparation
Lesson Narrative
In previous lessons, students learned about attributes of two-dimensional shapes. They also learned about perimeter and drew shapes with a given perimeter. In this lesson, students find perimeters of shapes given side lengths and use the attributes of shapes to find the perimeter given only some of the side lengths.
- Representation
- MLR8
- Compare and contrast (orally) strategies for calculating the perimeter of shapes given all the side lengths.
- Explain (using words and other representations) strategies for calculating the perimeter of a shape given its attributes and some side lengths.
- Encontremos el perímetro de más figuras.
Required Materials
Activity 2
Required Preparation
None
Teacher Reflection Questions
How did students leverage their geometry knowledge about attributes of shapes to reason about perimeter in today’s lesson?