http://mathforum.org/  

Read answers to math questions or pose your own questions.

http://www.factmonster.com/dictionary.html Find the meaning that you're looking for and so much more!
http://www.exploremath.com/activities/index.cfm Math made VERY visual; interactive models for graphing.
 http://www.visualfractions.com/  For the students who need practice with fractions.
 http://www.math.com/  Free homework help and lessons.
 http://www.mathgoodies.com/  Free math help site with interactive lessons.
 http://users.erols.com/bram/  Math dictionary, Cool Math links,and more!
 http://www.mathguide.com/  Free lessons and help center.
 http://www.learner.org/exhibits/dailymath/  Interactive articles about math and its role in our daily lives.
 http://www.mdcc.edu/kendall/esl/wave  Math students' write and enhance the ESL experience.