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Lesson 2: Adding negative numbers fluently

# Signs of sums on a number line

Let's build intuition for the sign of sum involving negative and positive numbers. We'll decide whether each sum ends to the left or right of 0. Then we'll evaluate exactly to see whether the intuition worked out. Created by Sal Khan.

## Want to join the conversation?

• bro im being forced to do this ;-; who else is forced
• meee :3
(1 vote)
• I didn’t even need the video it was so easy
• If you really dont like it, putting it on double speed, looking through the comments and playing music can make it more bearable(thats what im doing)
• dude why 7 minutes i could be playing seige right now
• For real
• It is the same stuff but on a number line what is the point but it does make a lot of sense.
• bro school is killing me
• Why is this so long?
Also, if it's -11 + -3, shouldn't you do absolute value then add it?
• Some people need longer videos to get a better understanding.
It is possible to do it without doing the absolute value.

-11 + (-3) = -14
Or as you say we should do:
|-11| = 11
|-3| = 3
11+3=14
Reverse to -14
It is faster and sometimes easier to do it without absolute value. (Most of the time).
Hope this helped!