National Library of Virtual Manipulatives
Utah State University
"The National Library of Virtual Manipulatives (NLVM) is an NSF supported project that began in 1999 to develop a library of uniquely interactive, web-based virtual manipulatives or concept tutorials, mostly in the form of Java applets, for mathematics instruction (K-12 emphasis). The project includes dissemination and extensive internal and external evaluation."
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The National Library of Virtual Manipulatives is a collection of online math-related applications appropriate for Pre-K – 12 students.
For more ideas about using online math games, take a look at Jan de Lange’s online math game walkthrough , or Mary Hynes-Berry’s blog post about math apps.