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Lesson 5: Properties of addition & subtraction

# Equivalent expressions with negative numbers

Understand that we can commute and associate terms as long as we keep the signs with the terms. We can also apply the additive identity property and the additive inverse property. Created by Sal Khan.

## Want to join the conversation?

• yay 2nd question
• WHy? w d y m?
(1 vote)
• how many kids are in this world
• Probably more then 3?
• 10 Minutes Again...…Not Fun
• It may not be fun. However, you get to learn more and get better! It may not seem like it but your brain is taking this information. You'll probably use it in your next test without knowing.

Trust me, it helps!
• This is not enjoyable. Like I guess I like math ok but being forced to do this is miserable.
(1 vote)
• Take it one step at a time. If it seems too hard or too boring, try a similar skill before coming back to it. If you feel like you are being overworked, try exercising for every half-hour of studying you do, as the brain's full concentration capacity at one time is 45 minutes, meaning that your brain can thoroughly focus on something that you don't like doing for a maximum of 45 minutes. A 10 minute break is enough to help the brain get what it needs.

If you are being forced to do this by your parents/guardians, talk to them about what's bothering you.
• First question!
• I can finally comment I've been doing this for 4 days now YESSSSSS