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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.

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Q: What is the lcd of numerator 2 and denominator 5?
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If you have a fraction of 2 5ths what is the numerator?

the numerator is 2 and the denominator is 5


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