Friday, April 29, 2011

Before

We'll take a break from algebra for a bit to focus on a concept that will be used a lot while learning algebra.
Negative numbers. Yes, there are things less than zero !
Amazing isnt it! Kinda like your bank account being negative 25 dollars because you were charged an overdraft fee. Now you will need 25 dollars just to make it back to zero dollars! Capitalism at its finest.

Lets get started. First adding and subtracting negative numbers

http://www.khanacademy.org/v/adding-subtracting-negative-numbers?p=Pre-algebra

Second: multiplying and dividing negative numbers

http://www.khanacademy.org/v/multiplying-and-dividing-negative-numbers?p=Pre-algebra

Forward March!

25 comments:

  1. dividing negative numbers is always fun

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  2. Things less than 0? BRAIN HURTS

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  3. Always in the red, such is life.

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  4. I remember how confusing this was in middle school. It was almost as difficult as learning imaginary numbers in high school. A lot of college kids now-a-days need this refresher (passing this on to my students, just before finals week nonetheless). I hope they stop by!

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  5. I hope you dont divide by zero ^^

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  6. Ten's complement is cool alternative also

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  7. I think I have to get back from the beginning of your blog and take it slow a bit

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  8. capitalism- it sucks, but do we have anything better?

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  9. Everyone hates negative values in their bank accounts :(
    So far progressing nicely through mathematics, I wish this teaching system was available when I was still in high school :S

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  10. Great read.

    Def hate seeing those negative numbers in my bank account. XD

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  11. I remember first having to learn this in school, i did not like it

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  12. divide by zero it will blow your mind

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  13. keep up your studies! we need intelligent people lol

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  14. Easy concept, now for imaginary numbers...

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  15. SimPle but i love it :)
    Followed

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  16. I hate algebra ¬¬ hahaha!!, nice blog, following :)

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  17. Don't you ever wish that you could have the internet while going through elementary school?

    good videos!

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