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

Updated: 9/25/2023

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Q: When adding or subtracting to decimals what is the first thing you must do?
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### What is the first thing you should look for when adding or subtracting fractions or mixed numbers?

common denominators.

yes

### How are addition and subtraction stories alike?

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.

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

Making sure the denominators are the same.

### When multiplying decimals with whole numbers do you line up the whole numbers?

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. :)

### What is the most important thing you can say about adding or subtracting fractions?

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

320

### Why is subtracting a negative number a positive number?

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.

### When graphing a function do you move it first before you flip it?

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!

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### What does 9 plus -2- 8 equal?

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.

### Is a decrease of a negative the same thing as the addition of a positive?

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