Because to add fractions, the denominators must be equal.
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.
Convert them to equivalent fractions with like denominators, then proceed.
In fractions, you can NEVER add or subtract
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.
Adding fractions is achieved by adding the numerators as long as the denominators are the same. When the denominators are the same the fractions are "like fractions". With different denominators they are "unlike fractions"; to be able to add them they need to be converted in to equivalent fractions with the same denominators. They are then "like fractions" and can be added.
first make denominators the same and add.
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.
you make fractions equivalent denominators, you add the numerators and put it over the denominator
To add fractions, you cannot simply add the numberators and add the denominators. To add fractions, they must first have the same denominator. Once they have the same denominator, you can then simply add the numerators.
You cannot add or subtract fractions with different denominators. If the denominators are different then you need to work with equivalent fractions.
yes of coarse! only if you are adding fractions that is.
Whether the denominators are common or not.
Do not add the denominators together. Though keep in mind that both denominators must be the same to add to fractions together.
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.
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 you want to add fractions that have different denominators, you have to convert them into fractions that do have the same denominators. So for example, how much is a half plus a third? Both of these can be converted into sixths, so one half equals three sixths, and one third equals two sixths. Three sixths plus two sixths equals five sixths. That's the answer. If you have three fractions with different denominators, the procedure is the same. Convert all three into fractions with the same denominators, then add them.
with different denominators, just get their lcd and that will serve as they're denominator.
numerators you add, denominators you leave it the same
When adding fractions with like denominators, add the numerators together and put the result over the denominator. Simplify if possible.
The same way you would add or subtract whole numbers, leaving the denominators alone.
The denominators are different, so find the equivalent fractions using the LCD , then add the fractions with the denominators.
Possible reasons: To add or subtract fractions, To compare fractions with different denominators.
To get the right answer when you add or subtract unlike fractions.