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)
