Cool Math 4 Kids:  Online math games for reinforcing skills with addition, subtraction, multiplication, division, fractions, decimals, etc.  Contains a link to coolmath.com for older students  and a 3 – 5 yr old section.  http://www.coolmath4kids.com/

Funbrain:   Games for math & reading, games grouped & searchable by grade level. http://www.funbrain.com/

Fun 4 the Brain:   Games for addition, subtractions, multiplication, division, science and just for fun. http://www.fun4thebrain.com/

Gamequarium: Interactive mathematics games, virtual manipulatives, online calculators, and graphing tools.  http://gamequarium.org/math.htm

Harcourt Math Glossary: Interactive math glossary for students in K-6 that provides a searchable database of math terms, accompanied by illustrations and animated examples. http://www.hbschool.com/glossary/math2/index.html

Illuminations - Weblinks: Search 724 web links for games and information for number sense, algebra, geometry, measurement, data analysis and probability.   http://illuminations.nctm.org/Weblinks.aspx

Illuminations - Activities:  Search 105 math activities online based upon grade spans. http://illuminations.nctm.org/ActivitySearch.aspx

Internet 4 Classrooms: Contains various math games and activities.  http://www.internet4classrooms.com

Mathematics Benchmarks, Grades K–12: Benchmarks for K-12, as well as models of secondary school courses, sample secondary school assessments, and tasks. http://www.utdanacenter.org/k12mathbenchmarks/

Math123xyz.com: Interactive multimedia math resources, including math lessons, interactive tutorials, learning tools, enrichment, and extra practice. Basic Skills, Pre-Algebra, Geometry, Algebra, and Trigonometry.  http://math123xyz.com/

Math Dictionary for Kids: More than 600 interactive mathematical definitions for elementary school students.  http://www.amathsdictionaryforkids.com/

Math Playground: Play logic games, solve word problems, and watch math videos.  http://www.mathplayground.com/

Mathwire.com: Activities, worksheets, and creative ideas for teaching math that are classroom-tested by teachers. Based on NCTM Standards.  http://www.mathwire.com/

National Library of Virtual Manipulatives: Interactive manipulatives to use.  For example: access a spinner, make a graph, etc. http://www.nlvm.usu.edu

Numbers Made Meaningful: Teacher-tested math stories and games based on the story Trouble with Zero, for PreK through grade 1.  http://www.numbersmademeaningful.com/

Rockin’ the Standards: A veteran elementary school teacher and his rock band have taken lyrics from common tunes and changed them to help kids remember the mathematics they’ve been taught in school.  http://www.rockinthestandards.com/site/

Soft Schools: Worksheets and games.  http://www.softschools.com/

Sumdog: Online games to practice addition, subtraction, multiplication, division, and equations.  http://www.sumdog.com

Superkids: Online resource for teachers or parents to create math worksheets on topics including addition, exponents, and telling time.  http://superkids.com/aweb/tools/math/

Time Monsters: Interactive online lessons and quizzes about time.  http://www.timemonsters.com/

Mr. Nussbaum's Math Site: Math games grouped by concept