Top Answer

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

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

Change them to like fractions and proceed.

Because to add fractions, the denominators must be equal.

You first convert them to equivalent fractions with a common denominator. Or you convert them to decimal fractions.

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

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.

because its just one of the rules of math :)

Because that is not how addition of fractions is defined.

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

To add and subtract unlike fractions.

When you want to add or subtract unlike fractions.

When you are trying to add or subtract unlike fractions.

When adding unlike fractions, find the LCM of the denominators and convert them to it.

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

Like fractions are the fractions which have the same denominator and unlike fractions are the fractions which do not have the same denominator.

Like fractions have the same denominator, unlike fractions don't.

unlike fractions

-1/2+7/10

The question is based on a complete misunderstanding of what is required. Unlike denominators are NOT required!

Use the GCF to reduce fractions. Use the LCM to add and subtract unlike fractions. Carpenters work with fractions a lot.

You can totally add fractions with unlike denominators. You have to first find the LCD (least common denominator) to make them the same denomintars. And then you can just simply add them. What you cannot do is add fractions with unlike denominators without changing them to fractions with like denominators. The reason being that you would be attempting to add fractions that are different sizes. 1/2 is not the same size as 1/3, so it would be like trying to add apples and oranges. You have to change them to a common size and that is the reason you have to find the least common denominator first. While you cannot add 1/2 and 1/3, you can add 3/6 and 2/6.

The GCF can be used to reduce fractions. The LCM can be used to add and subtract unlike fractions.

When adding unlike fractions, find the LCM of the denominators and convert them to it.

Use the GCF to reduce equivalent fractions. Use the LCM to add and subtract unlike fractions.

Unlike fractions are fractions having unlikedenominators, e.g., 1/4 and 1/6.