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

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.

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

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

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

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

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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.

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.

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

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 110.

To have a common denominator, you usually have two or more numbers. By listing only one number then it is its own common denominator.

The common denominator refers to a denominator that is COMMON to two or more numbers. You have only one number in the question! 6 = 6/1 so the denominator is 1.

Many places, but a common one is in adding fractions where we find a common denominator.