"Massachusetts Teachers' Domain is a free digital media service for educational use, brought to you by WGBH, WGBY, the Massachusetts Department of Elementary and Secondary Education, and our partners in public broadcasting. You’ll find thousands of media resources, support materials, and tools for classroom lessons, individualized learning programs, and teacher professional learning communities."
It is easy to register for an account and you can search specifically the Massachusetts edition or National K-12 (CCSS) resources, the MA edition is organized along the lines of MCAS "reporting categories".
Here is a sample of a search result for grade 8, geometry resources.
Within in a lesson you can look at the general category or select the CCSS option. Always refer back to the 2011 Massachusetts Curriculum Framework for Mathematics ("Blue Book") to ensure proper content alignment. Here is how to view the CCSS option on a resource page:
Be sure to let me know if you have any questions - post them here on the blog or send them to me, firstname.lastname@example.org