Here are some more websites that you may find useful for teaching math as well as professional development for yourself!
http://map.mathshell.org/materials/index.php – Grades 6th through High School. Provides comprehensive unit lessons aligned for both content standards and standards for mathematical practice. Some lessons are focused on developing math concepts, others on non-routine problem solving. There are also professional development modules that help teachers with pedagogical challenges of teaching mathematical practices, as well as formative assessment. Funded by the Bill and Melinda Gates Foundation.
http://blog.mrmeyer.com/ and www.ted.com/talks/dan_meyer_math_curriculum_makeover.html – Dan Meyers uses videos that he films and posts to vimeo to generate engaging and challenging real world math problems. Explore his 3-Act math strategy for teaching and his suggestions to improve math text book problems. His teaching is great for Middle and High School. However, there are teacher sites that have used his strategies with 4th and 5th grade as well.
http://www.purplemath.com – This site is good to develop content knowledge for algebra. It provides lessons that include techniques for learning, common mistakes, likely “trick” questions, and cross-references to help you find related material.
If you find some additional sites, please let us know!
Special thanks to friends and colleagues: Heidi Jenkins, Sandy Czajkowski, and Alison Place for the sites listed here!!