Main content

## 7th grade

### Unit 1: Lesson 1

Intro to adding negative numbers- Negative numbers: addition and subtraction FAQ
- Adding negative numbers example
- Adding numbers with different signs
- Signs of sums
- Adding negative numbers
- Missing numbers on the number line examples
- Missing numbers on the number line
- Adding negative numbers review

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# Adding negative numbers review

CCSS.Math:

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

## Adding negative numbers with a number line

### Adding 2 negative numbers

Lets add minus, 6, plus, left parenthesis, minus, 7, right parenthesis.

Step 1: Start at the first number, in this case minus, 6:

Step 2: Move 7 more places to the

**left**. We move 7 to the**left**because**adding negative 7 decreases**our number by 7.minus, 6, plus, left parenthesis, minus, 7, right parenthesis takes us to minus, 13 on the number line.

### Adding a negative number and a positive number

Lets add minus, 8, plus, 3.

Step 1: Start at the first number, in this case minus, 8:

Step 2: Move 3 places to the

**right**. We move 3 to the**right**because**adding positive 3 increases**our number by 3.minus, 8, plus, 3 takes us to minus, 5 on the number line.

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

## Want to join the conversation?

- how do u add 2 negative numbers if 2 negative numbers are positive(6 votes)
- you put a parenthesis on one of the negative numbers(3 votes)

- how will negative numbers help us when we get older(22 votes)
- If your are in debt i guess(41 votes)

- Why is -4+8= positive 4?(10 votes)
- Picture you have a number chart ranging from -10 to 10. You have a point that sits on -4. Then you move up from -4, 8 times.

-4 (Starting point),-3 (One time),-2 (Two times),-1 (Three times),0 (Four times),1 (Five times),2 (Six times), 3(Seven times) , 4 (Eight Times)

Thus -4+8=4, or you could look at it as 8-4=4.(30 votes)

- is 0 a prime or composite?(2 votes)
- It it neither. maybe it is composite because 0+0=0(4 votes)

- When your solving an equation,like: 6(3 + -7) can I just go and start solving the equation and determine if it's a positive or a negative, or do I have to do the number lines?(1 vote)
- You don't really need to have to do the number lines, you can do it any way you want. the answer for equation 6(3+-7) is -24 because you have to share the 6 in 3 and -7 so it is 18+ -42 and that equals -24.(4 votes)

- how do you take the square root of negative number?(8 votes)
- Great question!

In the real number system, it is not possible to take the square root of a negative number. The is because 0 times 0 is 0, a negative number times itself is a positive number, and a positive number times itself is a positive number.

In algebra 2, you will encounter an extended number system called the complex numbers in which it is possible to take the square root of a negative number. The set of complex numbers are all the numbers of the form a + bi, where a and b are real numbers, and the imaginary unit i is defined as the square root of -1.

For example, the square root of -9 is 3i. Note that 3i is a complex number because it can be written as 0 + 3i.

Have a blessed, wonderful day!(1 vote)

- this is the best site for me to learn i never liked math but now im getting better at it(7 votes)
- I like this buts its so hard to use(0 votes)

- Why is it that when adding two negative numbers they do not equal a positive?(1 vote)
- or it could be negative because the bigger one has a negative in it(1 vote)

- jiggle

man

lucas(6 votes) - Whats a negative times a negative times a positive times a 🧐(4 votes)
- A negative * negative is positive, and positive * positive is positive. I'm not even going to try to understand what the emoji is.(0 votes)