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Math Help - find the common denominator

  1. #1
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    Unhappy find the common denominator

    b c d
    __ x __ x ___
    2 2 2
    cd bd bc



    I seriously do not understand fractions !
    When I view this is looks wieird, it is b over cd squared times c over bd squared times d over bc squared. How do I find a common denominator with variables?
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  2. #2
    Super Member TheChaz's Avatar
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    Re: find the common denominator

    The LCD will be (bcd)^2.
    For each factor in the denominators, you'll have a corresponding factor in the LCD.

    Edit... Apparently, we aren't adding fractions...
    Last edited by TheChaz; November 20th 2011 at 07:59 PM.
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  3. #3
    MHF Contributor
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    Re: find the common denominator

    Quote Originally Posted by rikkiann View Post
    b c d
    __ x __ x ___
    2 2 2
    cd bd bc



    I seriously do not understand fractions !
    When I view this is looks wieird, it is b over cd squared times c over bd squared times d over bc squared. How do I find a common denominator with variables?
    Hang on, is it \displaystyle \frac{b}{cd^2} \times \frac{c}{bd^2} \times \frac{d}{bc^2} or is it \displaystyle \frac{b}{(cd)^2} \times \frac{c}{(bd)^2} \times \frac{d}{(bc)^2}?

    Either way, you don't need a common denominator when multiplying fractions, you just need to times tops and times bottoms, then cancel any common factors.
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