rational numbers

Rational numbers
http://www.uen.org/Lessonplan/preview.cgi?LPid=19826
http://www.k12.wa.us/CurriculumInstruct/Mathematics/background/schielack_teaching_focused.pdf

http://www.fi.uu.nl/rekenweb/en/

http://www.fi.uu.nl/rekenweb/en/ '

The learning classroom

http://www.learner.org/resources/series172.html

Rand report math proficiency

http://www.rand.org/pubs/monograph_reports/MR1643/MR1643.ch4.pdf

Norfolk teachers log on

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http://www.zoomerang.com/Survey/?p=WEB22975AQM3QY

MSRI VIDEOS

http://www.msri.org/communications/vmath/

Listen to the math guy

http://www.stanford.edu/~kdevlin/MathGuy.html