Unit 7, Lesson 11
Rectangles with the Same Perimeter
Grade 3
Preparation
Lesson Narrative
In previous lessons, students learned to find the area and perimeter of rectangles. In this lesson, students draw rectangles with a specified perimeter, find their areas, and notice that rectangles with the same perimeter do not always have the same area. Students then draw rectangles with a specific perimeter that have different areas.
- Engagement
- MLR8
- Draw rectangles with a given perimeter and different areas.
- Let’s explore rectangles with the same perimeter.
Required Preparation
- Create 4 visual displays. Each visual display should be labeled with a different perimeter. Use the following perimeters: 12 units, 20 units, 26 units, 34 units).
- Students cut out and tape their rectangles on one of the visual displays during this activity.
Teacher Reflection Questions
Who has been sharing their ideas in class lately? Make a note of students whose ideas have not been featured in class and look for an opportunity for them to share their thinking in tomorrow’s lesson.