# Lesson 13

Find the Area of Figures

### Lesson Purpose

The purpose of this lesson is for students to calculate the area of ungridded figures made of rectangles using multiplication and addition.

### Lesson Narrative

Students continue to find the area of figures composed of rectangles by decomposing them into non-overlapping rectangles. In this lesson, the square tiling is slowly removed to focus students on multiplying side lengths to find area.

• Engagement
• MLR7

### Learning Goals

Teacher Facing

• Calculate the area of ungridded figures made of rectangles using multiplication and addition.

### Student Facing

• Let’s find the area of figures.

### 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

This lesson is designed to help students shift toward multiplying to find areas, rather than by counting unit squares. Did you see this shift in students' strategies? What questions could you ask students about their strategies to help them make that shift if they are still counting frequently?

### Suggested Centers

• Five in a Row: Multiplication (3–5), Stage 2: Factors 1–9 (Addressing)
• Five in a Row: Addition and Subtraction (1–2), Stage 8: Add within 1,000 with Composing (Supporting)

### Print Formatted Materials

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