Websites 

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CA Department of Education
The California Department of Education site with information about the standards and the CCSS-related activities taking place in California.
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NRICH (K-12)
The NRICH Project aims to enrich the mathematical experiences of all learners. To support this aim, members of the NRICH team work in a wide range of capacities, including providing professional development for teachers wishing to embed rich mathematical tasks into everyday classroom practice. 

NRICH is a team of qualified teachers who are also practitioners in RICH mathematical thinking. This unique blend means that NRICH is ideally placed to offer advice and support to both learners and teachers of mathematics.
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Illustrative Mathematics (K-12)
Illustrative Mathematics is a discerning community of educators dedicated to the coherent learning of mathematics. We collaborate at illustrativemathematics.org, sharing carefully vetted resources for teachers and teacher leaders to give our children an understanding of mathematics and skill in using it. We provide expert guidance to states and districts working to improve mathematics education.
The goal of Illustrative Mathematics is:
  • to illustrate standards with impeccably crafted tasks, videos, lesson plans, and curriculum modules
  • to be the premier source of freely available online mathematics content for teachers, teacher leaders, assessment developers, curriculum writers, and teacher educators.
  • to be a discerning professional community that creates content and deploys expertise in multiple ways.
  • to engage individuals and small groups, with rare and needed expertise, who are currently isolated in pockets across the country.
  • to provide a space for teachers to share across classrooms and help each other grow in teaching our children mathematics.
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Smarter Balanced Assessment Consortium
Smarter Balanced is a state-led consortium developing assessments aligned to the Common Core State Standards in English language arts/literacy and mathematics that are designed to help prepare all students to graduate high school college- and career-ready.

What is a Growth Mindset? How can it help with Math?

Find out here: MindsetKit.Org is a free set of online lessons and practices designed to help you teach and foster adaptive learning mindsets.
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Inside Mathematics (K-12)
A professional resource for educators passionate about improving students' mathematics learning and performance. This site features classroom examples of innovative teaching methods and insights into student learning, tools for mathematics instruction that teachers can use immediately, and video tours of the ideas and materials on the site.
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The Mathematics Assessment Project (7-12)
The project is working to design and develop well-engineered assessment tools to support US schools in implementing the Common Core State Standards for Mathematics (CCSSM).
The project creates tools for formative and summative assessment that make knowledge and reasoning visible, and help teachers to guide students in how to improve, and monitor their progress. 

Websites with activities to use with your child

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The Teaching Channel
Teaching Channel is a video showcase -- on the Internet and TV -- of innovative and effective teaching practices in America's schools.  It features hundreds of helpful videos showing classroom practices that align with the CCSS-M. 
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Illuminations 
Illuminations is a project designed by the National Council of Teachers of Mathematics (NCTM) which includes lessons and interactives searchable by the Common Core State Standards: over 600 lesson plans  and over 100 activities; including virtual manipulatives, applets, and games.
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Howard County Public Schools, in Maryland, has a site, hcpssfamilymath.weebly.com, which includes links, videos, practice tests and more on the math curriculum, the Common Core State Standards and class lessons in kindergarten through 12th grade.