# Lesson 8 What is an Inch?

Let’s measure in inches.

## Warm-up Notice and Wonder: Inches and Centimeters

What do you notice? What do you wonder?

## Activity 1 What is an Inch?

Find 2 items that are about an inch long.

Measure the length of each object.

object to measure

length in inches

marker

colored pencil

11 connecting cubes

a book

your choice objects:

## Activity 2 Measure the Sides of Shapes

## Problem 1

Here is a rectangle.

How long is the long side of the rectangle in inches?

Estimate:

Measure the long side of the rectangle.

Actual length:

## Problem 2

Here is a square.

How long is a side of the square in inches?

Estimate:

Measure one side of the square.

Actual length:

## Problem 3

Here is a triangle.

How long is the longest side of the triangle in inches?

Estimate:

Measure the longest side of the triangle.

Actual length:

## Practice Problem

## Problem 1

What do you know about inches?

What is the length of the rectangle in inches?