Q: Why do fractions need to have common denominator before you add or subtract them simple answer pleas?

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To subtract fractions with like denominators, subtract the numerators , and write the difference over the denominator. Example : Find 45−25 . Since the denominators are the same, subtract the numerators.

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

By finding the lowest common denominator of the fractions.

First find the lowest common denominator and then adjust the fractions accordingly before subtracting the numerators

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.

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

The denominators must be the same before you can add or subtract fractions.

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

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.

by finding the common denominator of the fractions

No. If the denominators are the same, you subtract the numerators. If the denominators are different you have to find the least common denominator.

Yes.

The numerator of the answer is the result of subtracting the numerators of the fractions, and the denominator of the fraction is the same as the common denominator.

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

A common denominator is required to add or subtract fractions and not otherwise.

Convert them to improper fractions with a common denominator.

You have to find a common denominator, multiply them, subtract them and then simplify if you need to.

You can add or subtract fractions only if they are "like" fractions, that is, only if they have the same denominator - unless you know your fractions really well.

You first convert them to similar fractions, i.e., to fractions that have the same denominator.* Step one: find a common denominator.* Step two: convert both fractions to equivalent fractions that have that denominator.

If the denominators are the same, subtract the numerators. If the denominators are different, convert them to equivalent fractions with a common denominator and subtract the numerators.

You must first convert the fractions to equivalent improper fractions with a common denominator.

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.

To get the right answer when you add or subtract unlike 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.

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.

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