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Lesson 1: 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?

• tihs proevs i am teh bset at splilieingssg
• yeths i agwethre
• 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?
• You can do that.
For example: 1+(-1)=1-1=0
• this is not that bad!!
JUST pay attention and you would know
what to do and your done before you know it
• I am crazy .
• crazy? i was crazy once. they locked me in a room, a rubber room. a rubber room with rats, and rats make me crazy. crazy? i was crazy once. they locked me in a room, a rubber room. a rubber room with rats, and rats make me crazy. crazy? i was crazy once. they locked me in a room, a rubber room. a rubber room with rats, and rats make me crazy.
(1 vote)
• everyone here has been forced to do this
• So true
• if you've watched terminator 2 say hi :P
(1 vote)
• ive never seen that movie in my life, leave and never come back
(1 vote)
• what is pi times 87?
(1 vote)
• i'm fored to do this
(1 vote)
• its kinda like supraction, like 7 - -6.
(1 vote)
• i want to go home
(1 vote)