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NCTM electronic examples, of specific mathematic standards. Every teacher should have this site bookmarked. It lists standards and explains the appropriate expectations of each standard while providing some activities that directly address the standard. It also has a page for "Illuminations", a resource of lessons and activities supporting the standards.

This website offers lesson examples that align with the NCTM standards. It also offers other resources that I have used in the middle school classroom.

Math activities website sponsored by NCTM.

From NCTM - a great source of interactive discovery lessons and activities for math students

NCTM math standard open-ended math problems developed by The Franklin Institute in Philadelphia.

Math lessons for high school and middle school. These lessons have been writen by teachers who participated in SCORE Mathematics workshops and is designed for teachers in California but are correlated to the NCTM standards.