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## 7th grade

### Course: 7th grade > Unit 3

Lesson 4: Subtracting negative numbers fluently# 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(266 votes)
- Because two negatives equal a positive in a subtraction when it's next to each other. 3-(-6)=9=3+6=9(113 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?(56 votes)
- You could be mistaking this for a multiplication problem. negative * negative = positive but in addition negative + negative = negative.(11 votes)

- Give me 10 votes for Moon badge please(39 votes)
- i will still vote(21 votes)

- may people please press the upvote button for i am seeking a badge(43 votes)
- Say goodbye! Never gonna tell a lie!(1 vote)

- May 10 people consider pressing the upvote button as i pursue an educational moon badge(37 votes)
- pls give me ten votes for the moon badge(39 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.(6 votes)

- can 10 people please vote me i want the moon badge to(25 votes)