Some of my favorite math sites:
Illustrative MathematicsIllustrative Mathematics provides guidance to states, assessment consortia, testing companies, and curriculum developers by illustrating the range and types of mathematical work that students experience in a faithful implementation of the Common Core State Standards, and by publishing other tools that support implementation of the standards.
LearnZillion Video Lessons Grades 312 math video lessons tied to the common core state standards
Solve any math problem with WolframAlpha
KHAN AcademyLearn almost anything for free. With a library of over 3,800 videos on everything from arithmetic to physics, finance, and history and hundreds of skills to practice, we're on a mission to help you learn what you want, when you want, at your own pace.
The Quantile Framework for MathematicsCheck out the free resources available online linked to particular math skills, particular math textbooks, or the CCSS math standards.
CCSS Math Resources on PinterestCheck out the many resources posted on this pinterest site by regional content specialists  led by Teresa Emmert
Rational Number Projectcomplete research based lessons & units for teaching fractions – homework & assessments at the end of this 467page document http://www.cehd.umn.edu/ci/rationalnumberproject/rnp2.html
Illustrating the Standards for Mathematical Practice from NCSMExplore both the language of the Practice Standards and sample tasks from the national assessment projects as contexts though which you can consider implications that the Practices will have on your classrooms and students.
Achieve the Coreresources related to the Common Core State standards for Math & English/LA

Inside Mathematics  Great tasks with student work samples & rubrics matched to the CCSS for math. Explore materials and tasks you can use immediately with your students. Inside Mathematics has aligned our tasks and assessment resources with the Common Core State Standards for Mathematical Content. Note that you can make use of these standards through searching by grade level as well as by progression, so we have provided two routes through these tasks and other resources.
Dan Meyer's BlogDan Meyer is a former high school math teacher who shows us how to integrate technology into math class.
Dan Meyer's ThreeAct Math Tasks  spreadsheet with links to tasks http://graphingstories.com/ http://www.101qs.com/ CPALMS is an online toolbox of information, vetted resources, and interactive tools that helps educators effectively implement teaching standards. It is the State of Florida’s official source for standards information and course descriptions. Educator Toolkits  A toolkit of information, resources, and tools organized by grade level. Click here: www.cpalms.org/Public
YummyMathWe provide teachers and students with mathematics relevant to our world today …
We’ve created Yummy Math to provide teachers with an easy way to bring reallife into their math classrooms. It is our belief that when math is explored in contexts that are familiar and of interest to students, students will be more engaged to do math, reason, think critically, question and communicate. http://www.yummymath.com/birdseyeofactivities/ Math Live has animated lessons for students explaining math procedures using manipulatives
Teaching ChannelVideo Lessons, Teaching Ideas/Strategies, etc  free videos with great ideas for your classroom....
Great example of formative assessment in math  My Favorite No: https://www.teachingchannel.org/videos/classwarmuproutine Live Binders Math Common Core Resource CollectionHow to use this site: You can navigate through the information and resources on this site by using the tabs at the top. The dark grey tabs identify the main sections:
Tools for the Common Core Bill MacCallum's Blog  Lead writer of the CCSS Math Standards
NRICH enriching mathematicsThe 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. More information on many of our other activities can be found here.

Dr Jo Boaler is a Professor of Mathematics Education at Stanford University, and the faculty director of youcubed. She is the author of nine books – including the best seller: Mathematical Mindsets  and she has received numerous awards for mathematics equity and leadership.
Growth Mindset TASKS Posters FluencyWithoutFear Visual Math NCTM IluminationsSearch for activities, lessons & weblinks for your grade level math standards.
DYNAMIC PAPER  print most any kind of math paper
CC Better Lesson Over 3,000 complete Common Corealigned lessons from 130 Master Teachers. Thinking Blocks  Model your math problemsThinking Blocks is a suite of learning tools designed to help students solve math word problems accurately and efficiently. Using brightly colored blocks, students model mathematical relationships and identify known and unknown quantities. The model provides students with a powerful image that organizes information and simplifies the problem solving process.
MasteryConnectMasteryConnect makes it simple to share and discover common formative
assessments and track mastery of the Common Core standards. Builtin grading tools save teachers time. Kentucky Center for MathematicsMath tools, resources, interventions, professional development, including the Kentucky Numeracy Project materials, etc. Kentucky Numeracy Project
Searchable site math numeracy resources. Balanced Assessment in MathematicsOur library of assessment tasks  If you're just getting to know our materials, we'd like to suggest a few of our favorite tasks:
Primary (K to 2): Shirts in the Mirror, DottoDot, TV Shows Elementary (3 to 5): Fermi Four, Gardens of Delight, Broken Calculators Transition (5 to 7): Hockey Pucks, Bricks for Books, Crazy Clocks Middle School (6 to 8): Walkway, Confetti Crush, Fractured Subtraction High School, Basic & Exemplar: Ford and Ferrari, Oops! Glass Top, Postcards from the Falls High School: Ostrich and Seahorse, BumpyNess, Fermi Estimates II High School, Advanced: ParaBallA, Red Dots, Blue Dots, Dart Boards Technologybased (7 to 12): Full of Beans, Twinkle, Twinkle, Detective Stories KDE Standards for Mathematical Practices podcastshttp://itunes.apple.com/us/itunesu/kycoreacademicstandards/id423196565
View the Standards for Mathematical Practices podcasts featuring KY elementary, middle school & high school teachers from across the state. March Madness activities:Basketball Math questions from NCTM: http://www.figurethis.org/challenges/c31/challenge.htm
Lots of basketball math activities: http://www.bigwest.org/fastbreak/files/3_math.pdf Yummy Math  The perfect bracket: http://www.yummymath.com/2014/theperfectbracket2/ 