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The denominators must be the same before you can add or subtract fractions.

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βˆ™ 14y ago
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Q: When do you need a common denominator?
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Related questions

Does division need a common denominator?

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


Do you need a common denominator for all fractions before doing the order of operations?

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


How do you get the common denominator in dividing fraction?

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


How do you get the common denominator for dividing fractions?

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


What is the least common denominator of 9?

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


Do you need a common denominator for divison?

No.


Does NINETY have a common denominator?

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.


What is the common denominator of fraction 4 5th?

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


Do you need a common denominator for dividing fractions?

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


Why do you need a common denominator?

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.


What is the greatest common factor of the numerator 5 and the denominator?

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


Do you need a common denominator when multyplying fractions?

No.