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yes you should use a common denominator when subtracting with fractions, it makes it much easier.

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โˆ™ 2011-04-12 23:21:43
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Q: Do you need a common denominator when subtracting fractions?
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Related questions

Do you need a common denominator for dividing fractions?

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


Does division need a common denominator?

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


Do you need a common denominator in subtracting fractions?

Yes.


How is subtracting fractions like adding fractions?

You need a common denominator for both.


Do you have to find a common denomiter in dividing fractions?

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


Why do fractions need a common denominator before you add or subtract?

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


Why do fractions need to have a common denominator before subtracting or adding?

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


When adding or subtracting two fractions with denominators that are not equal what is the first step you take?

The first step to take is find the lowest common denominator of the fractions which can be done by finding the lowest common multiple of the numbers.


What is lowest common denominator of 17?

A single number cannot have anything in common. To find a lowest common denominator, you need to be adding or subtracting at least two fractions.


How do you get the common denominator for dividing fractions?

You don't need a common denominator to divide fractions.


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.


Do you need a common denominator for all fractions before doing the order of operations?

You DO need a common denominator to add, subtract, or compare fractions. You DO NOT need a common denominator to multiply or divide fractions.


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.


What do you do when you're going to subtract fractions but the numerator is the same?

Whether the numerators are the same or not, you need to get the denominators to be the same. First, find the least common denominator. Then convert the fractions to equal fractions that use the common denominator. Then you can subtract the fractions by subtracting the numerators. Finally, look for common factors between the numerator and the denominator of the difference in order to put the answer in simplest terms.


Do you need to have a common denominator when subtracting?

Yes.


Why do you need a common denominator?

Common Denominator means that the denominators in two (or more) fractions are common, or the same. The common denominator is important because before you can add or subtract fractions, the fractions need to have a common denominator.Sometimes fractions have different denominators, like 2/3 and 3/4. If you want to add or subtract them, they need to have the same denominator. In order to do that, you find a common denominator which is the same thing as a common multiple, only with denominators.


When subtracting fractions do you need common denominaters?

Yes


How do you get the common denominator in dividing fraction?

You don't need a common denominator to divide fractions.


Why do you need like denominators to add and subtract fractions?

Finding a common denominator makes it possible to add two fractions because it allows us to write each fraction as a multiple of a common (usually smaller) fraction. Subtracting fractions works the same way; find a common denominator so that the fractions involved are in the same terms.


Do you need a common denominator multiplying fractions?

No.


Do you need a common denominator when multyplying fractions?

No.


Do you need a common denominator to multiply fractions?

No.


Why do you need a common denominator when adding and subtracting fractions but not when you multiply or divide fractions?

For subtracting and adding you cannot add or subtract unalike things. For multiplication and division you can multiply by whatever you want. In some maths you even multiply by variables such as "x". Or divide by them.


How does the concept of LCM relate to fractions?

When you are adding or subtracting fractions with unlike denominators, you need to find a least common denominator, or LCD. The process is the same as finding an LCM between two integers.


When adding or subtracting fractions you need to?

Find a common denamonator.