Best Answer

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.

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

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

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

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

No.

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

Related questions

You don't need a common denominator to divide 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.

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

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

No.

No.

No.

You don't need a common denominator to 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.

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

No you do not.

Yes.