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You must "Join" this site, but then you have free access to a variety of math games in a virtual environment; playing against the computer, or other players.
Although there is an obvious button to download a trial version of the resources here, you CAN try out many of the tools without that. Start by selecting a section of the grid. When you are viewing a specific tool, there is a link to the standards at the top of the page.
This includes a comprehensive collection of interactive arithmetic lessons for grades K-8. Activities are arranged by grade level or broad topics. Timed practice can be used for assessment.
Operated by Drexel University (Goodwin College/School of Education), this site has resources, activities, and interaction with other math teachers at all levels.
This group sponsors math contests for students annually. This site has rules, registration information, and sample contests. Click on the "Math Help Facility" for classroom resources on a variety of math topics.
This is a place where elementary and middle school school students can practice their math skills. It includes math games, word problems, logic puzzles, manipulatives, and more.