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They don't have to - it just makes calculations easier.

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Q: Why do fractions have to have a common denominator?
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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.


What is the least common denominator of two fractions?

The least common denominator is the least common multiple of the denominators of the fractions.


What are fractions that have the same denominator called?

Like Fractions


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.


Is 3 over 4 or 5 over 8 bigger?

To compare fractions, convert them to a common denominator - in this case, a denominator of 8 will work.To compare fractions, convert them to a common denominator - in this case, a denominator of 8 will work.To compare fractions, convert them to a common denominator - in this case, a denominator of 8 will work.To compare fractions, convert them to a common denominator - in this case, a denominator of 8 will work.


How do you subtract fractions when denominator is different?

By finding the lowest common denominator of the fractions.


Find a common denominator for the pair of fractions. Then, write equivalent fractions with the common denominator?

Find google


Do you need a common denominator for dividing fractions?

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


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.


Why do you have to find a common denominator?

Addition or subtraction of fractions require "like" fractions: that is, fractions with the same denominator.


How do you add improper fractions if the denominator can't multiply into the other denominator?

You Ned to find a larger common denominator or multiply the denominators to gain a common denominator.


How do you add or subtract dissimilar fractions?

You first convert them to similar fractions, i.e., to fractions that have the same denominator.* Step one: find a common denominator.* Step two: convert both fractions to equivalent fractions that have that denominator.