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Topic:  Algebra Balance Scales 
Related Item:  http://mathforum.org/mathtools/tool/458/ 
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Subject:  Problems with negative numbers 
Author:  Joel Duffin 
Date:  Feb 17 2004 
One limitation I found with this applet is that the problems I encountered all
involved positive numbers. Most students don't have a problem with algebra
equations where they simply take away or divide.
Also, we used balloons tied to our scales to represent negative numbers or
antiwieghts. This applet would have been more useful in helping students
visualize the negative numbers.
>>> My reply
We have worked on a version of this applet that includes problems involving
negative numbers and uses balloons to represent them. I will see if I can dig it
up and post it.
 
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