# Lesson 10

Resolvamos problemas sobre perímetros y áreas

### Lesson Purpose

The purpose of this lesson is for students to solve problems that involve both perimeter and area of rectangles in order to reinforce the difference between perimeter and area.

### Lesson Narrative

In previous lessons, students learned what area is and how to find the area of rectangles and figures made up of rectangles. They also learned how to measure the perimeter of other shapes, solve problems that involved perimeter, and recognize situations in which perimeter is and is not relevant. By the end of this lesson, students confirm that while perimeter and area are both measurements that can appear together in problems, perimeter is a linear measurement while area is two-dimensional.

• Representation
• MLR1

### Learning Goals

Teacher Facing

• Solve problems that involve perimeter and area of rectangles.

### Student Facing

• Resolvamos problemas sobre perímetros y áreas.

### Required Materials

Materials to Copy

• Info Gap: A Garden and a Playground, Spanish

### Required Preparation

Activity 2:

• Each group of 2 will need a copy of the 2 data and problem card sets. Keep set 1 separate from set 2.

### 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

What was the best question you asked students today? Why would you consider it the best one based on what students said or did?

### Suggested Centers

• Can You Draw It? (1–5), Stage 3: Grade 3 Shapes (Addressing)