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You can add or subtract fractions only if they are "like" fractions, that is, only if they have the same denominator - unless you know your fractions really well.

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Q: Why do you need a common denominator with fractions?
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Related questions

How do you get the common denominator for dividing fractions?

You don't need a common denominator to divide 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.


Do you need a common denominator for dividing fractions?

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


Does division need a common denominator?

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


Do you need a common denominator when multyplying fractions?

No.


Do you need a common denominator to multiply fractions?

No.


Do you need a common denominator multiplying fractions?

No.


How do you get the common denominator in dividing fraction?

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


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.


Do you need a common denominator when subtracting fractions?

yes you should use a common denominator when subtracting with fractions, it makes it much easier.


Do you need a common denominator for dividing and multiplying fractions?

No you do not.


Do you need a common denominator in subtracting fractions?

Yes.