Here is where you will find links to examples and practice problems on the web.
Want more practice on what you are learning in class?
Regents Prep has examples and practice problems for almost every math topic.
The National Library of Virtual Manipulatives has virtual manipulatives that are related to the NCTM standards.
Here are some much better sites for online math learning:
http://illuminations.nctm.org/Activities.aspx
http://www.shodor.org/curriculum/advanced.php
http://www.ltcconline.net/greenl/java/
http://pbskids.org/cyberchase/games/probability/
http://school.discovery.com/
http://www.aleks.com
http://www.ruf.rice.edu/~lane/stat_sim/index.html
http://www.mathsnet.net/algebra/index.html