Activity Detail
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What's My Ratio?
 


Activity Overview

Students use linear measurement and calculators to investigate proportionality and determine the constant ratio between similar figures.

Before the Activity

  • See the attached PDF file for detailed instructions for this activity
  • Print student activity sheets pages 92 - 93 from the attached PDF file for your class

    		•

    		During the Activity

    		Distribute the pages to the class.

    Follow the activity procedures:
  • Draw a picture on centimeter grid paper
  • Decide to either increase or decrease the size of the picture, predict the dimensions in the increased or decreased version, and discuss reasoning
  • Draw the increased or decreased picture on grid paper, keeping the picture's original shape, to test the predictions
  • Discuss the use of ratio (comparing the measurements of corresponding parts) to describe how the picture has been increased or decreased
  • Divide students into groups
  • Give each group an interesting picture and a reduced or enlarged copy of the same picture
  • Ask each group to measure several pairs of corresponding parts on the two pictures, record their data on the recording sheet, and make some conclusions about copies of pictures

    		After the Activity

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

    Author:
    Texas Instruments

    Level:
    5-8, K-4

    Activity Time:
    60 Minutes

    Device:
    TI-10, TI-15 Explorer™

    Apps:
     

    Software:
     

    Accessories:
     

    Other:
    This is Activity 19 from the EXPLORATIONS Book:
    Uncovering Math with Manipulatives, the TI-10, and the TI-15 Explorer

    The following materials are required for this activity:

  • Ruler, string or measuring tape
  • Larger paper
  • Pictures with enlarged or reduced copies
  • Pencils and markers


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