http://en.wikipedia.org/wiki/Lowest_common_denominator
check above link.
good explanation
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(1) find the LCD. (2) find the factor that each original denominator needs to be multiplied by to get the LCD. (3) multiply both the numerator and the denominator by that factor.
Well, isn't that a happy little question! The least common denominator of 15 and 16 is 240. We can find this by multiplying the two numbers together, as 15 multiplied by 16 equals 240. Remember, there are no mistakes in math, just happy little accidents!
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The LCD of 7 and 77 is 77.