Here are a few free and premium websites that have reading and math games for students to use.

www.abcya.com

www.starfall.com

www.brainpop.com

http://sheppardsoftware.com/

www.pbskids.org

www.kindersite.org

www.ixl.com  This is a great website that conforms to state standards, but costs $79 a year.