Lesson 16
Compare Perimeters of Rectangles
Lesson Purpose
The purpose of this lesson is for students to apply multiplicative reasoning and their knowledge of fractions to solve problems about perimeters of rectangles.
Lesson Narrative
This lesson reinforces students’ understanding of the relationship between the side lengths and the perimeter of a rectangle and their ability to reason multiplicatively in a geometric context.
- Action and Expression
- MLR8
Learning Goals
Teacher Facing
- Solve problems involving the perimeter of rectangles using multiplicative comparison.
Student Facing
- Let’s solve problems about rectangles of different sizes.
Required Materials
Materials to Gather
Materials to Copy
- Centimeter Grid Paper - Standard
Required Preparation
Activity 2:
- Each group of 2 needs a 12-inch pipe cleaner, an inch ruler, and tape.
Lesson Timeline
| Warm-up | 10 min |
| Activity 1 | 10 min |
| Activity 2 | 15 min |
| Activity 3 | 10 min |
| Lesson Synthesis | 10 min |
| Cool-down | 5 min |
Teacher Reflection Questions
What evidence do you have that students' ideas about perimeter shifted or broadened as a result of this lesson?
Suggested Centers
- Can You Draw It? (1–5), Stage 4: Area and Perimeter (Supporting)
- Rectangle Rumble (3–5), Stage 3: Factors 1–10 (Supporting)
Print Formatted Materials
For access, consult one of our IM Certified Partners.
Additional Resources
| Google Slides | For access, consult one of our IM Certified Partners. |
|
| PowerPoint Slides | For access, consult one of our IM Certified Partners. |