is 0 a prime or composite?

It it neither. maybe it is composite because 0+0=0

Why is it that when adding two negative numbers they do not equal a positive?

it is negative because negative = minus; the expression two negatives make a positive is for multiplication, because a negative number times a negative number = a positive one, or when two mines signs are next to each other, then that means a plus sign

Why is -4+8= positive 4?

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.

how do u add 2 negative numbers if 2 negative numbers are positive

you put a parenthesis on one of the negative numbers

how do you take the square root of negative number?

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!

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?

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.

If your going backwards on a number line, then how come you are adding integers sometimes?

Good question! When we "add" negative numbers to one another, we move further left on the number line. So, -5 + (-2) = -7. I started at -5 and moved another -2, ending up at -7. The operation was "addition" of two negative numbers. (The words we use in math to explain processes can sometimes be confusing. I use the number line all the time to try and understand how to solve the problems like this. Once you get used to seeing how numbers move on the number line it will seem really natural.) Sal's videos are great for explaining this, but do all the exercises and use the hints if you need to. They really help explain this process. Hope this helps!

Main content

Arithmetic

Course: Arithmetic > Unit 18

Lesson 5: Intro to adding negative numbers

Adding negative numbers review

CCSS.Math:

7.NS.A.1

Google Classroom

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.

minus, 6, plus, left parenthesis, minus, 7, right parenthesis, equals, minus, 13

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.

minus, 8, plus, 3, equals, minus, 5

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

Practice

Problem 1

Current

Add.

5, plus, left parenthesis, minus, 4, right parenthesis, equals

Want to try some more adding negative numbers problems? Check out this exercise.

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Anselmo, Geoffrey
Posted 7 years ago. Direct link to Anselmo, Geoffrey's post “how do u add 2 negative n...”
how do u add 2 negative numbers if 2 negative numbers are positive
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- mmouaddib
  Posted 3 years ago. Direct link to mmouaddib's post “you put a parenthesis on ...”
  you put a parenthesis on one of the negative numbers
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kencob01
Posted a year ago. Direct link to kencob01's post “how will negative numbers...”
how will negative numbers help us when we get older
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- sloane
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  If your are in debt i guess
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ed orio
Posted 5 years ago. Direct link to ed orio's post “Why is it that when addin...”
Why is it that when adding two negative numbers they do not equal a positive?
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- nico di angelo
  Posted 5 years ago. Direct link to nico di angelo's post “it is negative because ne...”
  it is negative because negative = minus; the expression two negatives make a positive is for multiplication, because a negative number times a negative number = a positive one, or when two mines signs are next to each other, then that means a plus sign
  Comment on nico di angelo's post “it is negative because ne...”
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gael Vazquez
Posted 5 years ago. Direct link to gael Vazquez's post “is 0 a prime or composite...”
is 0 a prime or composite?
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- Fgomez
  Posted 9 months ago. Direct link to Fgomez's post “It it neither. maybe it i...”
  It it neither. maybe it is composite because 0+0=0
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Maryam
Posted 4 years ago. Direct link to Maryam's post “Why is -4+8= positive 4?”
Why is -4+8= positive 4?
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- Cave Johnson
  Posted 4 years ago. Direct link to Cave Johnson's post “Picture you have a number...”
  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.
  Comment on Cave Johnson's post “Picture you have a number...”
  (37 votes)
Anah Truxel
Posted 5 years ago. Direct link to Anah Truxel's post “If your going backwards o...”
If your going backwards on a number line, then how come you are adding integers sometimes?
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(4 votes)
Answer
- ＫＥＶＩＮ
  Posted 5 years ago. Direct link to ＫＥＶＩＮ's post “Good question! When we "a...”
  Good question! When we "add" negative numbers to one another, we move further left on the number line. So, -5 + (-2) = -7. I started at -5 and moved another -2, ending up at -7. The operation was "addition" of two negative numbers. (The words we use in math to explain processes can sometimes be confusing. I use the number line all the time to try and understand how to solve the problems like this. Once you get used to seeing how numbers move on the number line it will seem really natural.) Sal's videos are great for explaining this, but do all the exercises and use the hints if you need to. They really help explain this process. Hope this helps!
  Comment on ＫＥＶＩＮ's post “Good question! When we "a...”
  (28 votes)
Adriana Rubio
Posted 6 years ago. Direct link to Adriana Rubio's post “When your solving an equa...”
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?
Button navigates to signup pageComment on Adriana Rubio's post “When your solving an equa...”
(6 votes)
Answer
- Richard
  Posted 6 months ago. Direct link to Richard's post “You don't really need to ...”
  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.
  Comment on Richard's post “You don't really need to ...”
  (8 votes)
20018559
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Who likes minecraft
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- cbwareagle7
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  I love Minecraft!
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Julicz
Posted 2 years ago. Direct link to Julicz's post “how do you take the squar...”
how do you take the square root of negative number?
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- Ian Pulizzotto
  Posted 2 years ago. Direct link to Ian Pulizzotto's post “Great question! In the r...”
  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!
  Comment on Ian Pulizzotto's post “Great question! In the r...”
  (12 votes)
diamond.kelley
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this is the best site for me to learn i never liked math but now im getting better at it
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