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Q: When adding or subtracting to decimals what is the first thing you must do?

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common denominators.

yes

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.

Making sure the denominators are the same.

9 + (-2) - 8 = (-1) Order of operations does not matter in this example because adding and subtracting are the same thing but the reverse of each other.

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common denominators.

yes

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.

Making sure the denominators are the same.

Hey awesome Question. The answer is no you do not have to line up the decimals when multyping only when adding and subtracting. The main thing is when you multiply make sure you put the decimal in the right place in your answer. YOu count how may places their are behind the decimals in BOTH numbers then you make sure their are that many places behind the decimal in you answer. :)

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

320

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.

Flip it first. Think of it as order of operations in a basic math problem. You're technically multiplying the function by -1 first, then you're adding or subtracting next. Best thing my pre-calc instructor taught me all quarter!

-18

9 + (-2) - 8 = (-1) Order of operations does not matter in this example because adding and subtracting are the same thing but the reverse of each other.

No, the negative number would just become more negative and thus smaller. Subtracting a negative number, however, us the same as adding it