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### Course: Arithmetic>Unit 18

Lesson 8: Subtracting negative numbers fluently

# Adding the opposite with integer chips

Use integer chips to explore the conjecture that subtracting a number gives the same result as adding the opposite of the number. Created by Sal Khan.

## Want to join the conversation?

• Im not great at math yet i am acing this with 100% on everything. Um please explain. :p
• I think that the problems are always easy in the beginning of the unit. It gets more complicated at the end. Maybe this is a really-easy-to-understand-unit.
• my teacher is making me watch these even though i know how to do it
• Why did you add two positive chips when the question was both negative? I mean it would be much easier to just subtract 3 from 5 to find the answers.
• why would you wright -1 as -8? Just turn seven to a negetive and add it to the -1.... And with -3 - (-5) Just turn the two minus signs to adition you obviosly cant subract a negetive EX:
-3 - (-5) keep the three it looks like this
-3 + 5 =2 easy.....
• why is it so hard
• Because some math is hard
• Guys Now I'm confused with brackets of negative numbers
I thought you should add a bracket to seperate only when There are two symbol which represent different meanings
But at , Sal just add an unnecessary bracket on -3+5
Why is that?
• he probably did it because he was trying to explain how the inverse operations can be used to make equivalent expressions or something like that.