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You don't. You use the GCF to reduce the answer once the addition or subtraction is complete.

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12y ago

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Related Questions

Why do you have to find a common denominator?

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


Why do common denominators lead to the correct answer?

In what type of problem exactly? For addition and subtraction of fractions


When dividing fractions do need a common denominator?

No. Common denominators are needed for addition and subtraction, not multiplication or division.


How do you do modeling addition and subtraction of mixed fractions?

To model addition and subtraction of mixed fractions, first convert each mixed fraction into an improper fraction. Then, find a common denominator to align the fractions. Once they have a common denominator, perform the addition or subtraction of the numerators while keeping the denominator the same. Finally, if needed, convert the resulting improper fraction back into a mixed fraction for the final answer.


Do you need common denominators when subtracting fractions?

Yes. You need common denominators if you want to:Add fractionsSubtract fractionsCompare fractions ("which is larger?")You do not need common denominators to multiply or divide fractions. Thus, in the case of fractions, multiplication and division is actually easier than addition and subtraction.


What should be applied to fractions?

To simplify fractions, one should apply the greatest common divisor (GCD) to both the numerator and denominator. When performing operations like addition or subtraction, it's important to find a common denominator. Additionally, for multiplication and division, multiply the numerators together and the denominators together, and then simplify if necessary. Always ensure that fractions are in their simplest form for clarity.


A the answer of a addition subtraction multiplications or division of fraction should always be in the?

The answer to an addition, subtraction, multiplication, or division of fractions should always be expressed in its simplest form. This means that the numerator and denominator should be reduced to their lowest terms, ensuring that there are no common factors other than 1. Additionally, when adding or subtracting fractions, a common denominator must be found first.


What types of problems can be solved by using the least common multiple?

Adding and subtracting fractions.Problems involving the addition or subtraction of unlike fractions


How can knowing the greatest common factor and least common multiple help you when you add subtract and multiply fractions?

Knowing the least common multiple of the denominators will help you find a common denominator when adding and subtracting unlike fractions. Knowing the greatest common factor of the numerator and the denominator will help you reduce the fraction if possible.


When working with fractions and mixed numbers what 2 operations require that you find common denominators before beginning to work?

those two operations are addition and subtraction.


What is the smallest common multiples is called?

It is usually called the least common multiple. But it can also be called the least/lowest common denominator when it is used for addition or subtraction of rational fractions.


Do you have to have a common denominator when you are adding fractions?

Having a common denominator makes it easier to add or subtract fractions. You can also convert fractions to decimals and then do the addition or subtraction but that is really the same thing as having a common denominator of 10. 100. 1000. etc. Without a common denominator, you would have to mentally make adjustments for the values of fractions. Of course, that is really establishing a common denominator in your head.