2003 to about 2015
This address was first used by a small non-profit project that called itself The Assessment Center. It offered practice quizzes and short subject reviews in mathematics, science and social studies for grades 3 to 8, contributed by volunteers. Its pages were organised by grade under an address beginning /Schools/NC/Demoschool/, and several of them were cited by teachers, reading lists and reference works.
The project stopped being maintained. For several years the address served no working educational content at all, while the citations pointing at it stayed in place and slowly rotted.
2026 onward
The site was brought back in August 2026 by a different group of editors. Two decisions shaped what you see.
- The old addresses were kept. Where a page existed before, a page exists at the same address now, covering the same topic. That is why the paths look dated. A citation from twenty years ago should not lead to an error page.
- Nothing was recovered, everything was rewritten. The current pages are new work written in 2026. They are not copies of the originals, which were not available to us.
Affiliation
The current editors are not connected to the original non-profit or to anyone who ran it, and do not claim to speak for it. The history above is included because a reader arriving from an old citation deserves to know what changed. Nothing on this site should be read as a statement by the original project.
What the site covers
Arithmetic methods and science topics for grades 3 to 8. The mathematics pages concentrate on the methods that parents most often have not seen before, because those generate the most searching at homework time. The science pages cover the standard upper elementary topics.
Social studies, which the original project listed as coming soon for most grades, is not covered here yet either.
Corrections
Mathematics pages are checked by working every example and every answer. Errors still get through. If you find one, or an explanation that leaves a reader worse off, write to editors at ouronlineschools.org and say which page and which line. Every page carries the month it was last reviewed.
Using this material
Pages are free to read, print, and quote with attribution. Teachers do not need to ask before handing them out in class. The diagrams were drawn for this site.