By finding the lowest common multiple of the fractions with different denomiators that need to be added or subtracted
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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.
By finding the lowest common multiple of the denominators.
The LCD of 1/4 and 1/6 is 12
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!
You need at least two numbers to find something in common between them. The LCD of 2/3 and 3/4 is 12.