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Lesson 1: Intro to adding negative numbers

# Zero pairs worked example

When we have a positive unit and a negative unit, they add up to zero. We call that a zero pair. Let's use integer chips to represent the number -2, but not just with 2 negative chips. This will open the door for us to add and subtract with negative numbers. Created by Sal Khan.

## Want to join the conversation?

• What I do?
confusin.
• Same, all I did was count the positive signs first the negatives, then I grouped them together and all I had left was 2 of the negative signs
• why would they add new content? i literrally have to redo everything.
• umm you don't...
• I am in tenth grade.
(1 vote)
• I can't replay the video
• what do i do here
(1 vote)
• Does the + on top of - count as zero pairs?
(1 vote)
• Light work no reaction
(1 vote)
• We all know that if you walk 1 step forward then 1 step backward, it would get you back to where you started.

But that isn't really true, you don't know if you're walking the same distance each time so if you wak forward 1 step but the backward step is bigger than the forward step, then it would be less than where you started?

I guess numbers need units for EVERYTHING...
• yeah but if u take the same distance forward and same distance backwars u end up same place but obviously if ur step back is bigger then your forwarfs OFC ur ending backward. That my freind is closer to decimals then what this video is about. so imagine u walk up 1 meter forwarfs and 1.000000001 meter backward although its not noticable it isnt the same. But this video is taking about whole numbers.. so yeah ur right but so is this video