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Tool: Proportioner
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Go to: http://seeingmath.concord.org/.../Proportioner.html (opens a new window)
Description: Highlight proportion and scale with this tool that allows you to compare image dimensions by using one image to "paint" another. Use the Warm Up activity to familiarize yourself with the tool.
Technology Type: Java Applet 
Guide: User's Guide (opens a new window)
Author: The Concord Consortium
Language: English 
Cost: Does not require payment for use

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Activity: Comparing Measures with the Proportioner (PDF)
Courses: Math 7 Making comparisons, Scale
Geometry Perimeter, area, and volume