Discussion:  Factor Tree tool 
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Related Item:  http://mathforum.org/mathtools/tool/415/ 
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Subject:  factors with variables 
Author:  kristina hurley 
Date:  Jun 23 2004 
can usually pick up very quickly finding the factors for two or three numbers.
Students often have difficulty finding the gcf when adding or subtracting
rational expressions. Just adding a few variables to each number for
example:
12xy^2 and 32x^2y
 
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