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    alternap18's Avatar
    alternap18 Posts: 47, Reputation: 1
    Junior Member
    		  
    #1

    Sep 25, 2010, 10:12 AM
    How to find the lcd of a fraction
    ? I'm trying to find the lcd of 3/35+6/45
    How do you find it do you keep on rising the numbers like 45+45+45 until u get a large common denominator
    donf's Avatar
    donf Posts: 5,679, Reputation: 582
    Printers & Electronics Expert
    		  
    #2

    Sep 25, 2010, 10:26 AM

    There are several methods, but the most quick and easiest is to multiply both denominators together to get the new denominator, then calculate the new numerators.
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
    Uber Member
    		  
    #3

    Sep 25, 2010, 10:31 AM

    Well, there is a common way of finding the least common multiple easily. Set out the prime factors of the numbers and 'merge' the common factors.

    Code:
     35 =         5 x 7
 45 = 3 x 3 x 5
LCM = 3 x 3 x 5 x 7
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