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Q: When you subtract fractions do they have to have the same denomanator?

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They are like fractions.

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

You have to get a common denomanator to then work out if the numerator is also the same.

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

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.

Yes, but the numerator is different,same as adding fractions

you subtract the numerators, and leeave the denomonators alone

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.

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

We can only add or subtract fractions if they have the same denominators

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

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

Subtracting a negative fraction is the same as adding its positive equivalent.

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.

Make the fractions equivalent then subtract

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.

Yes the bottom has to be the same when subtracting fractions. The bottom (or denominator) tells you what you're working with. You cannot subtract thirds from halves just as you cannot subtract oranges from tissues.

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.

Because to add or subtract two fractions you first have to find equivalent fractions for both which have the same denominator.

Similar fractions are fractions with the same denominator. In order to add or subtract fractions they need to be similar.

To combine the fractions or subtract the fractions. Same method with mixed numbers.

Yes, you multiply the numerators together and the denominators together when multiplying two fractions

Same as for addition. Mainly, you have to convert the fractions to equivalent fractions that have the same denominator. After that, it is easy: just subtract the numerators and put the result on top of the common denominator.

subtract the top two and the bottom stays the same.....for example; 4/8-3/8=1/8