# Lesson 2

How Do We Measure Area?

### Lesson Purpose

The purpose of this lesson is for students to use square tiles to build shapes and measure area.

### Lesson Narrative

Previously, students compared the area of shapes informally—by cutting out and overlaying the shapes, by observing whether one shape would fit into another, and by covering the shapes with pattern blocks and comparing the number of blocks used.

In this lesson, students learn that squares can be used to measure area: by tiling all of the shape. Each square represents one unit of area, or one square unit. Inch tiles are used, but are referred to as “square tiles” with students to emphasize how the tiles are used to measure square units. Students learn that shapes that don’t have specific names can be referred to as “figures.”

In the next lesson, students will take a closer look at square tiles that overlap.

Provide inch tiles for students to use during the cool-down.

• Engagement

### Learning Goals

Teacher Facing

• Explore area by building shapes with unit squares.
• Use unit squares to measure area.

### Student Facing

• Let’s use square tiles to measure area.

### Required Materials

Materials to Gather

Materials to Copy

• Use Square Tiles to Measure Area

### Required Preparation

Activity 1:

• Each group of 4 needs 80 square tiles.

Activity 2:

• Each group of 2 needs 80 square tiles.

Building Towards

### Lesson Timeline

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

### Teacher Reflection Questions

What ideas and experiences do students have about area? How did they influence students' work?

### Suggested Centers

• Can You Build It? (3–5), Stage 1: Rectangles (Addressing)
• Five in a Row: Multiplication (3–5), Stage 1: Factors 1–5 and 10 (Supporting)