Mathematicians of the Seventeenth and Eighteenth Centuries Trinity College, Dublin. (Find accounts of the lives and works of seventeenth and eighteenth century mathematicians and other scientists, adapted from A Short Account of the History of Mathematics by W. W. Rouse Ball (4th Edition, 1908).)

Math Forum Drexel University, 2006.

Michigan Curriculum Framework in Mathematics. Michigan Department of Education.

Michigan Virtual University.

Mission: Critical Thinking Projects. David Mesher, 1999.

National Council of Teachers of Mathematics.

National Library of Math Manipulatives. Utah State University. (This is a digital library of interactive simulations that help students of all levels practice mathematics concepts. It contains manipulatives for grades 9-12 in the areas of number & operations, algebra, geometry, measurement, and data analysis & probability)

National Science Foundation's National Science Digital Library.

Principles and Standards for School mathematics. National Council of Teachers of Mathematics.

Allmath.com Allsites LLC, 2005. (Great Math site: On-site calculators convert distance, weight, and area, biographies of mathematicians.)

Brain Teasers Houghton Mifflin. (For grades 3-8.)

Generic Electrical Energy Cost Calculator CSG, Computer Support Group, Inc., 2006.

Datasets Glenmore High School, Australia.

Exploring Data Glenmore High School, Australia.

Fun Mathematics lessons Cynthia Lanius, Rice University, 2004.

How Stuff Works HowStuffWorks, Inc., 2006. (Cool site that explains how things works!)

Illuminations. NCTM with Marcopolo. (Search by grade level for activities. For lessons, which may include virtual manipulatives, search by grade level and standard.)

Interactive Online Math lessons. National Library of Math Manipulative, Utah State University.