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In order to add or subtract one fraction from another, they must have a common denominator, or the same denominator. That's because it's impossible to add two fractions that have a different number of parts.

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shanshan Jiang

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3y ago
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Jennings Hettinger

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3y ago
awsum ty
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Wiki User

8y ago

To get the right answer when you add or subtract unlike fractions.

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Wiki User

7y ago

If you multiplied by different values, it would change the value of the fraction. Multiplying by the same value keeps the ratio intact.

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Q: Why do fractions need a common denominator when adding subtracting?
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Related questions

When adding or subtracting fractions you must get a?

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 have to have a common denominator?

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


How is subtracting fractions like adding fractions?

You need a common denominator for both.


What is always needed when adding and subtracting fractions?

a common denominator


Does division need a common denominator?

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


When adding or subtracting two fractions what is a necessary requirement?

A common denominator.


What two operations reequire a common denominator?

Adding and subtracting fractions.


How do you solve a fraction problem when you don't have the same denominator?

If you are adding or subtracting unlike fractions, convert them to equivalent fractions with a common denominator.


What did you learn from adding and subtracting fractions?

I learned to always change the denominators before adding or subtracting the numerators. You must always have a common denominator before adding or subtracting.


How do you minnous fractions?

Subtracting fractions is similar to adding fractions. If the fractions have the same denominator, you subtract the numerators. If the fractions have different denominators, you have to convert to a common denominator first.Subtracting fractions is similar to adding fractions. If the fractions have the same denominator, you subtract the numerators. If the fractions have different denominators, you have to convert to a common denominator first.Subtracting fractions is similar to adding fractions. If the fractions have the same denominator, you subtract the numerators. If the fractions have different denominators, you have to convert to a common denominator first.Subtracting fractions is similar to adding fractions. If the fractions have the same denominator, you subtract the numerators. If the fractions have different denominators, you have to convert to a common denominator first.


Adding and subtracting unlike fractions steps?

first u find a common denominator