Fun Brain: Lots a cool math games and activities that you can do at home on your own or with your family! http://www.funbrain.com/
Houghtin Mifflin Mathematics: An interactive site that helps children prepare for math exams. http://www.eduplace.com/kids/mhm/index.html
Everyday Math: This math site is grade level appropriate and provides interactive games for students to practice on their own. Some activities are very challenging! http://www.center.k12.mo.us/EDTECH/edm/3.htm
Multiplication games http://www.multiplication.com
Addition Balloon Pop (Game) http://www.sheppardsoftware.com/mathgames/numberballoons/NumberBalloons_add_level1.htm
printable worksheets http://www.tlsbooks.com/thirdgradeworksheets.htm
Telling Time http://classroom.jc-schools.net/basic/math-time.html
Interactive math games! http://www.mathplayground.com/
More math games! http://www.coolmath4kids.com/