Main content

### Course: 7th grade > Unit 3

Lesson 3: Intro to subtracting negative numbers- Subtracting with integer chips
- Subtract with integer chips
- Number equations & number lines
- Number equations & number lines
- Graphing negative number addition and subtraction expressions
- Interpreting numeric expressions example
- Interpret negative number addition and subtraction expressions

© 2024 Khan AcademyTerms of usePrivacy PolicyCookie Notice

# Number equations & number lines

Integer equations to describe diagram.

## Want to join the conversation?

- why do you put ( ) on a negative number(17 votes)
- it helps you know wether or not it is a negative number.(15 votes)

- I mathematically hate math(34 votes)
- Bruh, my mom said that to get screen time I have to study for 120 minutes, I'm just watching this video to make time pass.(21 votes)
- I don't mean to offend, but studying for two hours should be manageable for you, even if it's seventh grade math. Instead of pitying yourself, you should feel grateful that your mom is invested in your future. Her insistence on your studying is to help you succeed, not to do her a favor. I'm not trying to argue with you, I just want to encourage you. You are capable of achieving anything if you put in the effort to study. So, @Vuyyuru and Yasshwanth, how do you feel now? I hope my words have lifted your spirits and motivated you.(6 votes)

- What is this comment section?(16 votes)
- I'm looking at this vidio for energy points(no jokes), because it is to easy(11 votes)
`if (x < 0) {`

return;

}(8 votes)- Hi you why is my life important(4 votes)
- in different situations(3 votes)

- why are negative numbers in brackets? For example, 14 + (-12)=(4 votes)
- To help tell that it is a negative number. In simpler form to separate it ,which makes it easier to tell the difference. For example let’s say I got this .

6- - 8

It is a bit harder to tell the difference. So now let me put it in parentheses.

6-(-8)

It separates the negative 8 from the negative sign making it easier to tell, but you don’t**HAVE**to put it. It just makes it easier to solve. Hope this helps!(4 votes)

- this is so easy :](4 votes)

## Video transcript

- [Voiceover] We're told
to fill in the blanks to complete the equation
that describes the diagram. So let's think about
what's going on over here. If we start at zero, and we
move one, two, three, four spaces to the right of zero,
this arrow right over here represents positive four. We already see that right
over here in the equation. Then from positive four,
from the tip of this arrow, we then go one, two,
three, four, five, six spaces to the left. So what we just did here is we just added a negative six to the positive four. Positive four plus negative six. Where does that put us? Well we see it puts us one, two spaces to the left of zero and
each of these spaces in this diagram are one. So two spaces to the left of zero is going to be negative two. This is fun. Let's keep
doing more examples. Write an addition equation
or a subtraction equation, your choice, so they're
giving us some choice, to describe the diagram. Alright, let's see what's going on here. We're starting at zero
and we're going one, two, three, four to the left. So if we're going four to the left or so we can say negative four, -4. And then we're going
to go another one, two, three, four, five, six, seven,
eight, nine to the left. So we could write this as
negative four minus nine is equal to. And when you go four to the left and then you go another nine to the left, you end up 13 to the left of
zero which is negative 13. Equals negative 13. So this way I've written it
as a subtraction equation I guess you could say. Negative four minus nine,
is equal to negative 13. Now another way I could have done it, I could have said negative
four plus negative nine is equal to negative thirteen as well. Either of those would
have been legitimate. Now I've written it as
an addition equation. Let's keep going. Fill in the blanks to
complete the equation that describes the diagram. So we're starting at zero, we go three to the left of zero,
that's negative three. Then we go another three
to the left of that. So we're going to add
another negative three. We're going to add another negative three and that puts us six to the left of zero. Well six to the left of
zero is negative six. And we're done.