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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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Q: How do you use greatest common factor with addition and subtraction of fractions?
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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.


When dividing fractions do need a common denominator?

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


Why do common denominators lead to the correct answer?

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


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.


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.


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.


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.


What is the LCD in math examples?

LCD stands for Lowest or Least Common Denominator. It's just like the LCM (Least Common Multiple) and is used to make fractions suitable for 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.


What else Could you call the least common multiple in addition or subtraction problem involving fractions?

If you apply it to the denominators, you could call it the least common denominator.


How do you find fractions from least to greatest?

you have to compare the common fractions


Which operations don't require a common denominator?

Addition and subtraction are the only fraction operations that need a common denominator. Multiplication, division, and exponents do not need a common denominator. In fact, it is best to use reduced fractions otherwise it gets very messy.


Where is greatest common factor use?

The greatest common factor is used to reduce fractions.


Why is it important to find the least common multiple?

It will help when adding or subtraction unlike fractions.


How do you subtract fractions in simplest form?

You first need to find a common denominator, not necessarily the least common denominator. Next, you rename the fractions according to the common denominator. Only then can you subtract the fractions. After subtraction you should simplify the answer.


How are equivalent fractions used in renaming when subtracting?

When subtracting one fraction to another, one or both fractions are renamed so that they have the same denominators. Then the result of the subtraction is the equal to the subtraction of the numerators divided by the common denominator.


When doing fractions why is it easier to multiply and divide fractions than add and substract fractions?

It is easier to multiply or divide fractions than to add or subtract fractions because in multiplication, you just have to multiply the numerator by the numerator and the denominator by the denominator. Same applies with division of fractions, except that you have to reciprocate the fraction you're dividing with (divisor) then proceed to multiplication. Whereas, in addition and subtraction of fractions, you still have to get their Least Common Denominator (LCD).


What are the factors and greatest common factor for?

Finding the greatest common factor helps when you are reducing fractions.


What is the greatest common denominator of 60?

In order to have a greatest common denominator, there has to be two numbers and they both have to be fractions. 60 has no greatest common denominator.


How do you sort fractions least to greatest?

Get each fraction to have a common denominator, and then sort the fractions from least to greatest based on the numerators.


Do you do factors of the greatest common factor or multiples?

When doing fractions it is the greatest common factor (GCF) and the least common multiple (LCM). You want the GCF when you are reducing fractions to their simplest form. When changing the denominators to a common one, you want the LCM.


What operations of rational expressions require a common denominator?

addition and subtraction, you dummy


Equivalent fractions using least common denominator?

In order to add and subtract fractions with unlike denominators, it is necessary to convert them to equivalent fractions with a common denominator. Example: 1/4 + 1/6 The LCM of 4 and 6 is 12. 1/4 = 3/12 1/6 = 2/12


How do you add fractions with unlike denometiors?

You look for a common denominator; convert the fractions to equivalent fractions with the denominator you found; then you do the addition itself.