Activity Detail
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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

    		Other Downloads




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    Subject Area:
    Math : PreAlgebra : Geometry
    Math : Middle Grades Math : Geometry

    Author:
    Texas Instruments

    Level:
    5-8

    Activity Time:
    60 Minutes

    Device:
    TI-73 Explorer™

    Apps:
     

    Software:
     

    Accessories:
     

    Other:
    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


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