I'm not sure if you got the right abbreviation of that term.
LCD = Least Common Denominator = 1
GCD = Greatest Common Denominator = 17
LCM = Least Common Multiple = 34
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1/3 and 3/8 have a lcd of 24 (8/24 and 9/24)
You need at least two fractions to find something in common.
If that's 84 and 35, the LCD is 420.If that's 8/4 and 3/5, the LCD is 20.
The Greatest Common Factor of 12, 15 is 3.
Assuming you mean the LCM (Least Common Denominator of 2 fractions is the LCM of the denominators, which for 7/1 and 16/1 is 1), the answer is 112.