http://www.clcmn.edu/kschulte/mathworksheets.html

www.algebrahelp.com

http://www.matti.usu.edu/

 - National Library of Virtual Manipulatives, Over 100 high quality award winning applets are organized by grade level and NCTM Standards. Each applet is accomplanied by instructions, lessons plans, suggestions for outside activities, assessment suggestions, examples of similar physical manipulatives, and links to the NCTM Principles and Standards.

http://illuminations.nctm.org/

 - NCTM Illuminations Tools - For each Illuminations tool, a title, picture, grade level, and description are given. Once the tool is opened, instructions, activities, and interactive hints are given

free graph paper templates online

http://www.incompetech.com/beta/plainGraphPaper/

 nice lesson plans, brainteasers,...

http://school.discovery.com