From the Department of Education, the NCES Kids’ Zone provides a wide variety of educational games and quizzes. Students can see how they compare to other students from around the world in various subjects, search for information about schools and libraries, build graphs, explore the statistics of dice rolls, and play other games.
My favorites on this website included the Dare to Compare page. Students can take a short quiz in civics, economics, geography, history, math, or science in their selected grade level, and see how their answers compare regionally, nationally, and world-wide! Also, the monthly Math Teaser provides students with really unique problems.
Check out the site and let us know what you think!