| In order to reduce  , the numerator and denominator must share a common factor. This common number must evenly divide into both of them without any remainder or decimal. 
 
 In order to completely reduce the fraction, you must divide the numerator and the denominator by the greatest common factor (GCF). The GCF of
  and  is  (note: click here if you need help with finding the GCF). So divide both the numerator and denominator by   
 
 
 In other words, to reduce the fraction you do this
 
  
 
 
 
  Plug in the numerator, denominator, and the GCF 
 
 
  Now divide 27 by  to get 9. This is now the new numerator. 
 
 
  Now divide 105 by  to get 35. This is now the new denominator. 
 
 
 So
 
 
  
 
 
 
 This means that
  reduces to  
 
 
 In other words,
  
 
 
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