Math Goodies

This site has begun the process of aligning their lessons to the Common Core Standards.  Grade 3 is linked now.  There are lessons and an interactive exercise/quiz at the end of each lesson.

8 Standards for Mathematical Practice

NCTM process standards of problem solving, reasoning and proof, communication, representation and connections.

XP Math - Grades 5-9

Math Games Arcade - eXPerience
How do you integrate Common Core State Standards in the math classroom? How do you engage your students and increase interest in math? XP Math features fun and educational math games for Grades 5-9. Mental mathematics is a component of the Common Core Mathematical Practices and XP Math Games makes it easy to support it. XP Math allows teachers to differentiate instruction by process and content by providing tools to collect and analyze student data at every stage of their learning.

SoftSchools Math

Math concepts, tips, games, and worksheets.  Grades K-8

The National Science Digital Library

The NSDL Math Common Core collection features digital learning resources that address concept and skills components of the Math Common Core State Standards. The collection is organized by grade level and domain, as defined within the Common Core documents. Resources in this collection include lesson plans, simulations, problem sets with explanations, student activities that provide feedback, and other interactives. The collection will continue to grow as new resources are added regularly.

Math Chimp

Math Chimp! We collect free online math games and organize them by the common core standards. We're glad you've come to play cool math games here... they're free and always will be!