# Lesson 9 Relate Area to Multiplication

Let’s explore the area of rectangles with one side length that is a unit fraction.

## Warm-up Which One Doesn’t Belong: Area

Which one doesn’t belong?

## Activity 1 Find the Area

Find the area of the shaded region. Explain or show your reasoning.

## Activity 2 Draw Rectangles

Represent each rectangle on grid paper:

unit by 1 unit unit by 2 units unit by 3 units unit by 4 units

Find the area of each rectangle that you drew.

What information do you need to find the area of the shaded region?

What might the area of the shaded region be? Explain or show your reasoning.

## Practice Problem

## Problem 1

How are the diagrams the same? How are they different?

How is finding the area of the shaded region the same? How is it different?