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Math Help - reducing problem (LCD)

  1. #1
    Newbie steresopolis's Avatar
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    Feb 2009
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    reducing problem (LCD)

    7/8 +5/6


    in my book in makes the LCD 24 but why can it not be 18 since 8x2=16
    and 6x3=16 ????



    I get 29/16 the book gets 41/24 because its using 24(LCD)



    What am I doing wrong????
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  2. #2
    Newbie
    Joined
    Sep 2008
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    ya 8*2 is 16, but 16 cannot be divided by 6 without remainder, 6*3 = 18 not 16. so what you have done is wrong there.

    so the common one is 8*3 = 6*4 = 24

    7/8*3/3= 21/24
    5/6*4/4 = 20/24
    adding we get 41/24.
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