Find instructional materials that have been developed by respected organizations at the Marco Polo website. It includes links to sites developed by such respected organizations as the American Association for the Advancement of Science, the National Council on Economic Education, the National Endowment for the Humanities and the National Geographic Society. The National Geographic web site includes a wealth of resources for teaching geography K-12. Among the site's resources is the Xpedition Hall section, which takes visitors on a global tour featuring various thematic elements of geography. Word Problems for Kids is a Canadian site with problems classified into grades five through 12.
Students can get helpful hints for difficult problems via hints link.
Ask Dr. Math . Students in all grades can get math problems answered online for free here. Plus, they can review archives of questions asked by other students. Math helps students improve their math skills interactively. Lots of games and puzzles.