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Making sure the denominators are the same.

Q: What is the most important thing about adding and subtracting fractions?

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common denominators.

It's the same thing as adding or subtracting normal fractions - just make sure both fractions have the same denominators (by either multiplying the denominators or simplifying the fraction - whichever the question needs).

Addition and subtraction can be thought of as the same thing because subtracting a negative number is the same as adding it and adding a negative number is the same as subtracting it.

yes

Least common multiples and lowest common denominators are essentially the same thing. Once the denominators are the same, it's easier to get the correct answer when adding and subtracting fractions.

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the most important thing is to change the denominators so u can make common denominators

common denominators.

It's the same thing as adding or subtracting normal fractions - just make sure both fractions have the same denominators (by either multiplying the denominators or simplifying the fraction - whichever the question needs).

Subtracting a negative number is the same as adding the positive version. So 3- (-4) = 3+7. The same thing is true of all numbers, including fractions. So just add the fractions like you would normally do.

Addition and subtraction can be thought of as the same thing because subtracting a negative number is the same as adding it and adding a negative number is the same as subtracting it.

yes

Common factors go into the numbers, the numbers go into common multiples.

Least common multiples and lowest common denominators are essentially the same thing. Once the denominators are the same, it's easier to get the correct answer when adding and subtracting fractions.

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It is a double negative, subtracting is essentially adding a negative, therefore subtracting would be a negative negative number, which would be a positive, my mom helped me remember it by thinking if a bad thing happened to a bad person, it would be good, if a good thing happened to a good person it would be good, if a bad thing happened to a good person it would be bad, ect.

I'm really sorry I've done this before but i just totally am thinking the same exact thing!

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