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?

A centimeter cube and two rulers with tick marks and numbers labeled differently.

Activity 1 What is an Inch?

Ruler, from 0 to 6, by ones, measuring inch tile.

  1. Find 2 items that are about an inch long.

  2. 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.

Rectangle.

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

    Estimate:

  2. Measure the long side of the rectangle.

    Actual length:

Problem 2

Here is a square.

Square.

  1. How long is a side of the square in inches?

    Estimate:

  2. Measure one side of the square.

    Actual length:

Problem 3

Here is a triangle.

Triangle.

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

    Estimate:

  2. Measure the longest side of the triangle.

    Actual length:

Practice Problem

Problem 1

Rectangle.

  1. What do you know about inches?

  2. What is the length of the rectangle in inches?