The Math Forum Figure This (math index) home take a challenge The Pythagorean Theorem includes a Pythagorean Joke a proof of The Theorem a proof of The Theorem somewhat theoretical a nice compilation of proofs Simple Base Ten on-line activity Problem sets - an elementary school's math clubClick on the math club by year. Rationals: Multiplication, Division, and Applications A Tast From The North Pacific Nice worksheets (ideas) on a variety of concepts Dr. Margo Lynn Mankus Some very nice activities on several concepts. A nice problem set from CanadaProblems listed by grade level. The Eisenhower National Clearing House An endless resource of problems and ideas. Problems with a Point Grades 6 through 12; select problems by interest or current math ability Stacks of pennies and really big numbers Scholastic WebSite Some nice math mysteries on a variety of skills Select a grade, content area, and category. Some nice activities. Pleasanton Sch. Dist. (fractions)
Student & Teacher Excellence Project Philosophies of Mathematics Education Office of Educational Research and Improvement, US Department of Education MathematicallySane: rational reform of school mathematics National Council of Teachers of Mathematics (NCTM) Homepage Principles and Standards
3D paper folding; nets; probably the best site I've seen
Simon Tatham's Portable Puzzle Collection
