Best Answer

Add the numerators and put that over the denominator; reduce the final fraction.

example:

1/8 + 3/8 = (1 + 3)/8

= 4/8

= 1/2

Q: How do you add fractions with like denominators?

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Because to add fractions, the denominators must be equal.

The same way you would add or subtract whole numbers, leaving the denominators alone.

because they are the same number

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.

When you add or subtract fractions with like denominators, you just add or subtract the numerators and put them over the same denominator. For example, 3/5 - 2/5 = (3 - 2)/5 = 1/5

Related questions

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.

If the denominators are not the same, then you have to use equivalent fractions which do have a common denominator . To do this, you need to find the least common multiple (LCM) of the two denominators. To add fractions with unlike denominators, rename the fractions with a common denominator. Then add and simplify.

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 adding fractions with like denominators, add the numerators together and put the result over the denominator. Simplify if possible.

No.

Because to add fractions, the denominators must be equal.

The same way you would add or subtract whole numbers, leaving the denominators alone.

No, the denominators have to be the same.

If the denominators are not the same, then you have to use equivalent fractions which do have a common denominator . To do this, you need to find the least common multiple (LCM) of the two denominators. To add fractions with unlike denominators, rename the fractions with a common denominator. Then add and simplify.

because they are the same number

To add fractions w/ common denominators, like 2/5 + 1/5, you must ONLY add the numerator, or the top numeral.