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Math Help - LCD of fractions

  1. #1
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    LCD of fractions

    Find the LCD of the following fraction.

    3/a , 3/b , 1/5


    Please explain to me how to get the answer to this problem. Thanks in advance!
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  2. #2
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    Quote Originally Posted by cutiepi_86 View Post
    Find the LCD of the following fraction.

    3/a , 3/b , 1/5


    Please explain to me how to get the answer to this problem. Thanks in advance!
    How would you find the LCM of 3, 5, and 7? It's simply 3*5*7 = 105.

    In this case we need the LCM of a, b, and 5. Since we can't factor any of a, b, or 5 the best we can do is multiply them:
    a*b*5 = 5ab.

    So the LCD of 3/a, 3/b, and 1/5 is 5ab.

    -Dan
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