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Because trying to add them without a common denominator would yield an incorrect answer.

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13y ago
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Q: Why can't unlike fractions be added without common denominators?
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Related questions

How do you subtract fractions without alike denominators?

Convert unlike fractions to equivalent fractions with common denominators by finding the LCM of the denominators.


What way is subracting fractions with unlike denominators like adding fractions with unlike denominators?

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.


When adding fractions with unlike denominators it is most helpful if the fractions are renamed using the?

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.


Fractions with unlike denominators and no common factors to have common denominators?

Multiply them by each other.


Adding unlike fractions?

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.


What is an common multiple of the denominators for two or more fractions?

Multiplying the denominators together of two or more unlike fractions will get you a common multiple.


How is adding like fractions and adding unlike fractions the same?

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.


Explain how comparing fractions with like denominators differs from comparing fractions with unlike denominators?

Because when you compare fractions with the same denominators, you do not have to find the least common denominator (LCM or LCD).


Fractions with different denominators are called?

unlike fractions


How can you find a common denominator for two unlike fractions?

Find the lowest common multiple of the denominators and adjust the fractions accordingly


What are Fractions that have different denominators?

unlike fractions


How can you find common denominator for two unlike fractions?

multiply the two denominators