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Because otherwise you would be "adding apples and Oranges" as the popular saying goes.

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12y ago
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Q: Why does a denominator have to be the same to add or subtract?
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Related questions

How do you add and subtract fractions with the same denominator?

it stay the same when you subtract fractions and when you add fractions.


Do you add and subtract like and unlike fractions in the same way?

no, to add and subtract like and unlike fractions the denominator has to be the same,


How do you add or subtract fractions when negative?

The same as with positive ones. Make sure they have the same denominator and add or subtract their numerators.


Why does the denominator has to be the same?

it makes it eaiser to add subtract or divide or multiply


How do you add and subtract like denominator?

You add or subtract only the numerators


How do you add and subtract improper fractions with different denominator?

he fact that they are improper is irrelevant. Re-scale the fractions so that they have the same denominator and thenadd or subtract as required.


How are fractions under addition?

In order to add or subtract fractions, they must have the same denominator.


When do you need a common denominator?

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


When you add or subtract fractions with the same denominators what happens to the denominator in your answer?

It stays the same. Only the numerators change.


Why is it easy to subtract and add with the fraction that has the same donominator?

When adding or subtracting fractions with the same denominator, it is easier because we can simply add or subtract the numerators and keep the denominator the same. The denominators are already equal, so no additional calculations or adjustments are necessary. This simplifies the math and makes it easier to compute the result.


How do you add and subtract similar fraction?

Just simply add/subtract the numerators then copy the denominator.


What you need to add or subtract fractions?

You need a common denominator in order to add or subtract fractions.