Q: Why must you find a common denominator before adding fractions?

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Just add the fractions, and divide by 2. Before adding, you have to convert to a common denominator; in this case, you can use "4" as the common denominator.Just add the fractions, and divide by 2. Before adding, you have to convert to a common denominator; in this case, you can use "4" as the common denominator.Just add the fractions, and divide by 2. Before adding, you have to convert to a common denominator; in this case, you can use "4" as the common denominator.Just add the fractions, and divide by 2. Before adding, you have to convert to a common denominator; in this case, you can use "4" as the common denominator.

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

Because the answers will be wrong when adding or subtracting them if they don't have a common denominator.

To subtract fractions with like denominators, subtract the numerators , and write the difference over the denominator. Example : Find 45−25 . Since the denominators are the same, subtract the numerators.

They have to have a common denominator

Because if there's no common denominator it'll be hard to simplify. And will cause you to get a headache.

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

Find the lowest common denominator

Many places, but a common one is in adding fractions where we find a common denominator.

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

yes

A Common Denominator

Yes.

You need a common denominator for both.

If the denominators are not the same, then you have to use equivalent fractions which do have a common denominator . To do this, you need to find the least common multiple (LCM) of the two denominators. To add fractions with unlike denominators, rename the fractions with a common denominator. Then add and simplify.

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

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

Find a common denominator and proceed.

Common denominator

a common denominator

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

If the denominators are not the same, then you have to use equivalent fractions which do have a common denominator . To do this, you need to find the least common multiple (LCM) of the two denominators. To add fractions with unlike denominators, rename the fractions with a common denominator. Then add and simplify.

When adding or subtacting fractions make sure that the denominators are of the same values if they are not then find the lowest common denominator.

A common denominator.

Adding and subtracting fractions.

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