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Q: What do you not have to think about when you add or subtract fractions?

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

Make the fractions equivalent then subtract

it stay the same when you subtract fractions and when you add fractions.

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

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.

Numerators

Because think of like fractions as the same things.. you can subtract halves from halves for example, but what does it mean to take away a half from a third?By converting them into like fractions, we can add or subtract them easily.

it is important to learn how to add and subtract fractions because we can use it when a time comes , when we have our own business and others .

They are called like fractions.In order to add or subtract fractions you will usually need to convert them to like fractions. Then you simply add or subtract the numerators (as required) to form the numerator of the answer. The same (or common) denominator is the denominator of the answer. You may need to simplify the resulting fraction.

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.

Because to add fractions, the denominators must be equal.

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.

In order to add or subtract fractions, they must have the same denominator.

Yes.

The same as with positive ones. Make sure they have the same denominator and add or subtract their numerators.

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.

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

When you want to add or subtract fractions.

add? dont you mean subtract?

he fact that they are improper is irrelevant. Re-scale the fractions so that they have the same denominator and thenadd or subtract as required.

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

you take away one of the whole number=then you add or subtract your fractions=

It allows you to add and subtract the fractions with greater ease.

because its just one of the rules of math :)