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### Course: Arithmetic>Unit 18

Lesson 5: Intro to adding negative numbers

Let's model and evaluate sums using integer chip diagrams. When all the integer chips are negative, we can just count up our total negatives. When we have a positive integer chip and negative integer chip, those pair up to equal zero. So our sum is whatever chips are left over. Created by Sal Khan.

## Want to join the conversation?

• But in school they taught us that you should keep the first number, change the sign to the opposite one(like addition is turned into subtraction and subtraction is turned into addition) and change the number to the opposite as well, negative 6 for example, would be positive 6). I never saw that in the video. Are we supposed todo that and if so how do you know when to?
• buddy calm, i dont spaek Mathic
• Man i don't really get this. I give up.
• If you don't get it watch other youtube videos that will help you solve this or search up how to do it.
• this is not that bad!!
JUST pay attention and you would know
what to do and your done before you know it
• That's true you just need to pay attention
(1 vote)
• DYK That if you pause then unpause the video, it gives you more energy points? Pretty cool! EDIT: You can stop commenting telling me im wrong now. I have learned my lesson. Blessings!
• I don't think so...it just seems like it, you still end up with the same amount as u usually would
(1 vote)
• how does that work
(1 vote)
• H e l p m e
(1 vote)
• what this mean like im so confused what in the actual heck
(1 vote)
• How would you model with integer chips: 3-(-8)=__ ?
And keep a consistent definition/application of the (-) sign?
(1 vote)
• I like to keep in mind tips like knowing -(- just means + and
+(- or -(+ just means -
(1 vote)
• So they are always + 1 and -1 ( the integer chips?)
(1 vote)
• Well, they can be. But, they can be any type of number. such as, -2, and 1, the -2 being the "pink chips" and the 1 being the "yellow chips" Hope this helps!
(1 vote)
• could you have a integer that has a variable like -y