Lesson 17

Más problemas sobre perímetros

Lesson Purpose

The purpose of this lesson is for students to solve geometric problems using their understanding of length measurements, unit conversion, multiplicative comparison, and addition or subtraction of fractions.

Lesson Narrative

In a previous lesson, students were reminded about the relationship between the side lengths and the perimeter of a rectangle and reasoned multiplicatively to solve problems about those measurements. In this lesson, they continue to do so but in contexts that require them to convert the units and interpret them. Students also consider the perimeter of other quadrilaterals.

  • Representation
  • MLR7

Learning Goals

Teacher Facing

  • Solve problems involving perimeter using multiplicative comparison and addition or subtraction of fractions (including mixed numbers)

Student Facing

  • Resolvamos problemas sobre el perímetro de varias figuras.

Required Materials

Materials to Copy

  • Missing Measurements - Large, Spanish
  • Missing Measurements - Small, Spanish

Required Preparation

Activity 2:

  • If the activity is done as a gallery walk, print and cut 1–2 copies of the blackline master with the larger images and post them around the classroom. Otherwise, print and cut 1 copy of the blackline master with the smaller images for each group of 3–4 students.

CCSS Standards

Building On


Lesson Timeline

Warm-up 10 min
Activity 1 15 min
Activity 2 20 min
Lesson Synthesis 10 min
Cool-down 5 min

Teacher Reflection Questions

As students shared their ideas today, how did you ensure all students’ voices were heard? In what ways did you show that all voices are valued and important for collective learning?

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

Teachers with a valid work email address can click here to register or sign in for free access to Cool Down, Teacher Guide, and PowerPoint materials.

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