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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

Lvl 10
3y ago

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More answers

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

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Wiki User

9y ago
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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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Wiki User

7y ago
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Q: Why do fractions need a common denominator when adding subtracting?
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