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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
• Me 😭
(1 vote)
• I didn’t even need the video it was so easy
• That is so true.
(1 vote)
• It is the same stuff but on a number line what is the point but it does make a lot of sense.
• 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!
• bro school is killing me
• Why do i suck at math?
• Are the courses in Khan Academy's 7th grade section universal? or is it just western?