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You need common denominators. Then add or subtract the numerators. If the answer is an improper fraction it is common practice to reduce it to a mixed number.

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โˆ™ 2013-08-21 23:28:16
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Q: How do you add and subtract fractions in math?
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Related Questions

When do you use LCM in math?

When you want to add or subtract unlike fractions.


Why do you have to turn unlike fractions into like fractions to add or subtract?

because its just one of the rules of math :)


How do you add and subtract fractions with the same denominator?

it stay the same when you subtract fractions and when you add fractions.


What school subject is fractions related to?

Math is related to fractions. if you look in a math book or just online then one of the math topics is fractions. You learn how to divide, multiply, add and subtract, simplify and more about fractions and what to do with them.


What you need to add or subtract fractions?

You need a common denominator in order to add or subtract fractions.


How do you add and subtract dissimilar fractions?

Make the fractions equivalent then subtract


Do you add and subtract like and unlike fractions in the same way?

no, to add and subtract like and unlike fractions the denominator has to be the same,


How do you add two fractions that have like denominators?

In fractions, you can NEVER add or subtract


Why are two fractions converted into like fractions?

Because you can't add or subtract fractions that have different denominators. Making them like fractions, by multiplying so the denominators are the same, you can add and/or subtract them.


To add and subtract fractions less than 1 you add or subtract only the what?

Numerators


How are fractions used in math?

Often in Math, fractions are used to add, subtract, multiply, divide, or indicate the magnitude of measurements that will be involved in those operations. They can be used as numbers whenever the authentic number is not an integer.


Is it important to know how to add and subtract fractions why?

it is important to learn how to add and subtract fractions because we can use it when a time comes , when we have our own business and others .


How do you add mixed numbers?

Find theLeast Common Denominator (LCD)Find the equivalent fractions.Add or subtract the fractions and add or subtract the whole numbers.Write your answer in lowest terms.


How do you add and subtract by fractions?

If the fractions have the same denominator, add and subtract the numerators as if the denominators weren't there and put the result over that denominator. Reduce if possible. If the fractions have different denominators, find the LCM of the denominators and convert the fractions to equivalent fractions with like denominators. Then add and subtract the numerators as if the denominators weren't there and put the result over that denominator. Reduce if possible.


When you add and subtract fractions can the answer be a mixed number?

Yes.


When you add or subtract fractions with unlike denominators why do you have to find LCM?

Because to add fractions, the denominators must be equal.


Do you add or subtract the data in math?

You add or subtract (or use other operators) depending on what is required.


How are fractions under addition?

In order to add or subtract fractions, they must have the same denominator.


How are lcm's used in adding or subtracting fractions?

To add and subtract fractions, you need common denominators. To find the common denominator, take the LCM of the denominators you wish to add or subtract.


How do you add or subtract fractions when negative?

The same as with positive ones. Make sure they have the same denominator and add or subtract their numerators.


When does the LCM come in handy?

When you want to add or subtract fractions.


What do you not have to think about when you add or subtract fractions?

Whether the denominators are common or not.


How is finding the LCM revelant when adding and subtracting fractions?

To add and subtract fractions, you need common denominators. To find the common denominator, find the LCM of the denominators you wish to add or subtract.


How do you add and subtract fractions with unlike denominators?

Convert them to equivalent fractions with like denominators, then proceed.


Why do fractions need to have a common denominator before add or subtract them?

because it would be diffcult to understand.[you don't add or subtract the demonters]