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!

capitalism sucks balls.

ReplyDeletedividing negative numbers is always fun

ReplyDeleteThings less than 0? BRAIN HURTS

ReplyDeleteAlways in the red, such is life.

ReplyDeleteI 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!

ReplyDeleteno not below zero!!!!!11

ReplyDeleteI hope you dont divide by zero ^^

ReplyDeleteTen's complement is cool alternative also

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

ReplyDeleteawesomeeeeeeeeeeeeeeee

ReplyDeletethanks for the help!

ReplyDeletecapitalism- it sucks, but do we have anything better?

ReplyDeleteEveryone hates negative values in their bank accounts :(

ReplyDeleteSo far progressing nicely through mathematics, I wish this teaching system was available when I was still in high school :S

Great read.

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

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

ReplyDeletedivide by zero it will blow your mind

ReplyDeletekeep up your studies! we need intelligent people lol

ReplyDeleteSome time off is needed!

ReplyDeletethis one was easy!

ReplyDeleteEasy concept, now for imaginary numbers...

ReplyDeleteSimPle but i love it :)

ReplyDeleteFollowed

hehe interesting

ReplyDeleteI hate algebra ¬¬ hahaha!!, nice blog, following :)

ReplyDeleteHaha good work

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

ReplyDeletegood videos!