Lesson 16

Comparemos perímetros de rectángulos

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

  • Resolvamos problemas sobre rectángulos de diferentes tamaños.

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.

CCSS Standards

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

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Student Task Statements pdf docx
Lesson Cover Page pdf docx
Cool Down Log In
Teacher Guide Log In
Teacher Presentation Materials pdf docx
Blackline Masters zip