Q: When do you need a common denominator?

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You DO need a common denominator to add, subtract, or compare fractions. You DO NOT need a common denominator to multiply or divide fractions.

Common Denominator means that the denominators in two (or more) fractions are common, or the same. The common denominator is important because before you can add or subtract fractions, the fractions need to have a common denominator.Sometimes fractions have different denominators, like 2/3 and 3/4. If you want to add or subtract them, they need to have the same denominator. In order to do that, you find a common denominator which is the same thing as a common multiple, only with denominators.

No.

You need at least one more fraction in order to have a common denominator.

A common denominator is 7.A common denominator is 7.A common denominator is 7.A common denominator is 7.

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No, You only need a common denominator when adding or subtracting fractions.

You DO need a common denominator to add, subtract, or compare fractions. You DO NOT need a common denominator to multiply or divide fractions.

You don't need a common denominator to divide fractions.

You don't need a common denominator to divide fractions.

You need at least two numbers to find a common denominator.

No.

You need at least two numbers to find something in common. 90 can be a common denominator of other numbers, but it can't have a common denominator all by itself.

You need at least two fractions to calculate a common denominator.

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

Common Denominator means that the denominators in two (or more) fractions are common, or the same. The common denominator is important because before you can add or subtract fractions, the fractions need to have a common denominator.Sometimes fractions have different denominators, like 2/3 and 3/4. If you want to add or subtract them, they need to have the same denominator. In order to do that, you find a common denominator which is the same thing as a common multiple, only with denominators.

We will need a value for the denominator to answer that.

No.