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From: roger <RBREEN@FCCJ.EDU> To: Teacher2Teacher Public Discussion Date: 2006071019:28:13 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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