The Lowest Common Denominator is needed when adding or subtracting fractions.
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The LCD of 1/4 and 1/6 is 12
You don't normally calculate the lcd of a single number (fraction). You would normally take the lcd of two or more fractions. In that case, ONLY the denominators are relevant to find the lcd.
I believe it's the LCD, or least common denominator, and continue from there.
By finding the lowest common multiple of the denominators.
It is not possible to give a sensible answer to this question. The least common denominator (LCD) refers to a multiple that is COMMON to two or more numbers. You refer to only one number in the question!