Education Technology

# Activities

• ##### Subject Area

• Math: PreAlgebra: Geometry
• Math: Middle Grades Math: Geometry

6-8

60 Minutes

• ##### Device
• TI-73 Explorer™
• ##### Other Materials
This is Activity 5 from the EXPLORATIONS Book:
Discovering Mathematics with the TI-73: Activities for Grades 5 and 6

The following materials are required for this activity:
• Transparency of a tree graph
• Copies of the tree graph for every student

## Do You See What I See?

#### Activity Overview

Students discover how pictures formed by graphing ordered pairs can be stretched and shrunk by multiplying and dividing the coordinates.

#### Before the Activity

• Set up the calculator as explained in the activity
• See the attached PDF file for detailed instructions for this activity
• Print pages 21 - 24 from the attached PDF file for your class
• #### During the Activity

Distribute the pages to the class.

Follow the Activity procedures:

• Examine the transparency of the tree graph
• List the x- and y- coordinates for the points on the graph
• Enter the ordered pairs as lists in the calculator
• Graph the points for the ordered pairs and observe the shape of the tree
• Change the y-values and predict the change in the shape of the tree
• Use the new list of ordered pairs, plot the points, and verify the prediction
• Understand that the tree can be made tall by increasing the y-values
• Repeat the activity by changing the x-values
• Observe that the tree can be made wide by increasing the x-values
• #### After the Activity

Students complete the Student Activity sheet.

Review student results:

• As a class, discuss questions that appeared to be more challenging
• Re-teach concepts as necessary