Teacher resources and professional development across the curriculum

Teacher professional development and classroom resources across the curriculum

Monthly Update sign up
Mailing List signup
Follow The Annenberg Learner on LinkedIn Follow The Annenberg Learner on Facebook Follow Annenberg Learner on Twitter
Learning Math Home
Measurement Session 6: Area Introduction
Session 6 Part A Part B Part C Homework
measurement Site Map
Session 6 Materials:

Session 6, Part B:
Exploring Area With a Geoboard (50 minutes)

In This Part: Subdividing Area | The Rectangle Method | Formulas | The Triangle Formula

Let's further examine the concept of area, using a geoboard. The unit of area on the geoboard is the smallest square that can be made by connecting four nails:

We will refer to this unit as 1 square unit.

On the geoboard, the unit of length is the vertical or horizontal distance between two nails. Perimeter is the distance around the outside of a shape and is measured with a unit of length.

Use the following Interactive Activity to work on the geoboard problems in Part B. For a non-interactive version, use an actual geoboard and rubber bands, or print the dot paper worksheet (PDF). Use a space enclosed by five dots both vertically and horizontally to represent a single geoboard.

This activity requires the Flash plug-in, which you can download for free from Macromedia's Web site.

Problem B1


Make the following figures and find the number of square units in the area of each: Note 2

Stop!  Do the above problem before you proceed.  Use the tip text to help you solve the problem if you get stuck.
equals 1 square unit. equals 0.5 a square unit.   Close Tip


Problem B2


Make the following figures:


A square with an area of 4 square units


An isosceles triangle with an area of 4 square units


A square with an area of 2 square units (this is not a trick question!)

Next > Part B (Continued): The Rectangle Method

Learning Math Home | Measurement Home | Glossary | Map | ©

Session 6: Index | Notes | Solutions | Video

© Annenberg Foundation 2016. All rights reserved. Legal Policy