5th Math, Unit 7

Positive & Negative Integers
http://www.learnalberta.ca/content/mesg/html/math6web/index.html?page=lessons&lesson=m6lessonshell06.swf

Preston S.
Exponents :
http://www.youtube.com/watch?v=dQ9A-o3dUlM
Preston S.
Adding and subtracting positive and negative numbers:
http://www.youtube.com/watch?v=R3ugqwQugVo

Paul =-D