Factors and Common Denominators

Ah yes!  High School!  Those were the days!  I remember!  Hanging out at the pool hall.  Cherry cokes.  Girls.  Well, not many girls, really.  Wrestling practice.  And mathematics!  Sweet, sweet mathematics.  Things like proofs, matrix algebra, factors, and everybody's favorite: the lowest common denominator.

Quiz: what do the following terms have in common: "Factor",  and "lowest common denominator"? 

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