Q: What is always needed when adding and subtracting fractions?

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

The Lowest Common Denominator is needed when adding or subtracting fractions.

When adding or subtracting fractions with different denominators the lowest common denominator is needed and is found by finding the lowest common multiple of the denominators.

In more than 40 years as a mathematician, I have never needed to do so.

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

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

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

The Lowest Common Denominator is needed when adding or subtracting fractions.

When adding or subtracting fractions with different denominators and when reducing fractions to their lowest termsWhen adding or subtracting fractions with different denominators their lowest common multiple is needed and when reducing fractions to their lowest terms their greatest common factor is needed.

LCD means lowest common denominator which is needed when adding or subtracting fractions that have different denominators.

When adding or subtracting fractions with different denominators then the least common multiple amongst them is needed to find the lowest common denominator.

Least common multiple is needed to find the least common denominator when adding or subtracting fractions with different denominators Greatest common factor is needed when reducing fractions to their lowest terms

When adding or subtracting fractions with different denominators the lowest common denominator is needed and is found by finding the lowest common multiple of the denominators.

heat. adding or subtracting

as many as needed to satisfy the accuracy needed.

Fractions! Otherwise you don't have anything to add.

In more than 40 years as a mathematician, I have never needed to do so.