Illuminations from the NCTM.
This interactive site is aligned with the School Standardsfor
Mathematics from the National Council of Teachers of Mathematics.
Choose interactive games by clicking on the options on the left hand
menu.
National Library of Virtual Manipulatives for Interactive Mathematics: Award-winning
site from Utah State University. this project began in 1999 to develop
a library of uniquely interactive, web-based virtual manipulatives or
concept tutorials, for mathematics instruction (K-12 emphasis).
Web site was developed to help students
improve their math skills interactively.Grade levels are specified on the top navigation bar. Try the Games link.