www.hotmath.com - textbook solutions, membership required.

edhelper.com - math and other educational resources online, membership required.

www.thatquiz.org -  free online resource for math practice and testing.

jangombert.com - math challenge in a minute.

www.mathplayground.com - an action-packed site for elementary and middle school students.

www.braingle.com - brain teasers, riddles, logic problems and mind puzzles.

www.sheppardsoftware.com - games to help make learning fun.

nlvm.usu.edu - library of uniquely interactive, web-based virtual manipulatives.

villainyinc.thinkport.org - Villainy, Inc. : Thwarting World Supremacy through Mathematics.

fantasticcontraption.com - A fun online physics puzzle game.

www.nicholson.com/rhn/basic/ - download for Chipmunk Basic.

my.hrw.com/math06_07/nsmedia/tools/Graph_Calculator/graphCalc.html - online graphing calculator.

www.mathproblemgenerator.com

http://xrjunque.nom.es/precis/rootfinder.aspx - polynomial root finder

http://www50.wolframalpha.com/- solving math problems online.

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