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## 7th grade

### Course: 7th grade > Unit 1

Lesson 2: Intro to subtracting negative numbers# Subtracting negative numbers review

Review the basic of subtracting negative numbers and try some practice problems.

## Subtracting negative numbers

Subtracting a number is the same as adding the opposite of the number.

Let's look at two examples:

Note: In both examples, we change subtraction to addition and changed the sign of the second number to the opposite sign.

*Want to know why this works? Check out this video.*

Once we have an addition problem, we can solve.

### Example 1: negative minus negative

Lets subtract minus, 5, minus, left parenthesis, minus, 6, right parenthesis.

Step 1: Rewrite as an addition problem

Step 2: Start at the first number in the addition problem, in this case minus, 5:

Step 3: Move 6 places to the

**right**. We move 6 to the**right**because**adding positive 6 increases**our number by 6.minus, 5, plus, 6 takes us to 1 on the number line.

### Example 2: negative minus positive

Lets subtract minus, 4, minus, 7.

Step 1: Rewrite as an addition problem

Step 2: Start at the first number in the addition problem, in this case minus, 4:

Step 3: Move 7 places to the

**left**. We move 7 to the**left**because**adding negative 7 decreases**our number by 7.minus, 4, plus, left parenthesis, minus, 7, right parenthesis takes us to minus, 11 on the number line.

*Want to learn more about subtracting negative numbers? Check out this video.*

## Want to join the conversation?

- why does it say subtract when you have to add(260 votes)
- Because two negatives equal a positive in a subtraction when it's next to each other. 3-(-6)=9=3+6=9(109 votes)

- Negative minus a positive is a negative?(72 votes)
- Yes, subtracting a positive always makes the number smaller.(53 votes)

- So basically 2 negatives make a positive?(57 votes)
- You could be mistaking this for a multiplication problem. negative * negative = positive but in addition negative + negative = negative.(12 votes)

- So, correct me anyone if I'm wrong. So let's say I have

-4-(-4), wouldn't equal 0? Because instead of me subrtracting with -4, I have to add it. So, would it be 0 instead of -8?(31 votes)- Yes that is correct.(7 votes)

- pls give me ten votes for the moon badge(37 votes)
- Give me 10 votes for Moon badge please(22 votes)
- i will still vote(11 votes)

- I am confused that 8 - (-2) means you add up. IS that count Mr.Khan?(16 votes)
- Because when you do a subtraction problem with a positive taken away, you go down. 8 - 2 = 6 When that's negative, you have the
*opposite*, so you go up. 8 - ( - 2 ) = 10 You still might wonder why it isn't - 10, but I can answer it. Subtraction and addition like this stuff are never gonna give you negative.(11 votes)

- pls get me ten votes for the moon badge :](23 votes)
- so two negatives make a positive(6 votes)
- It depends on the operation.

Adding two negatives always makes a negative.

Subtracting two negatives could make zero, a negative, or a positive depending on how the two negatives compare to each other.

Multiplying or dividing two negatives always makes a positive.(7 votes)

- why does it add when it says to subtract?(14 votes)
- When you have a double negative, or two negatives in a row, it is the same as having a positive.

2+2 = 2-(-2) there are two negatives in a row so it becomes positive.(11 votes)