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A common denominator is required to add or subtract fractions and not otherwise.

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Q: When is a common denominator needed and when is one not needed?

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At least one other fraction is needed to determine a common denominator.

A common denominator is needed when adding or subtracting fractions of different denominators.

At least two fractions are needed to determine a common denominator.

At least two fractions are needed in order to determine a common denominator.

No only when adding or subtracting fractions a common denominator is needed

The lowest common denominator needed is 24

Two or more numbers are needed to find their lowest common denominator which is the same as their lowest common multiple.

At least two fractions are needed to determine a least common denominator.

A common denominator, though not the least, is 80.

a common denominator

If you mean fractions of 3/4 and 5/8 then the lowest common denominator needed is 8

A common denominator, though not the least one, is 180.

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