From: roger <RBREEN@FCCJ.EDU>
To: Teacher2Teacher Public Discussion
Date: 2006071020:28:13
Subject: 3 ARROW

	
YOU ARE REFERRING TO THE DEFINITION FOR ADDITION OF FRACTIONS.

a/b + c/d = (ad + bc)/bd.

It is also true for subtraction

a/b - c/d = (ad - bc)/bd.

It is best used when the denominators are mutually prime, that is when
the only common factor is he number 1.

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