Spelling City has math vocabulary lists
http://www.missouricareereducation.org/doc/core/MathGlossary.pdf
Glossary for upper grades in easily readable chart form
http://www.cgcs.org/site/Default.aspx?PageID=244
Parent Roadmaps to Common Core – directly tied to Engage New York, has a brochure for each grade level that explains the concepts taught at that level. These might be worth printing to send home at the beginning of the year.
www.illustrativemathematics.org/
A great resource site. It gives clearly explained examples of how to solve each type of problem for the Common Core Standards in a particular grade level.
http://www.insidemathematics.org/index.php/mathematical-content-standards
This site has good materials for every standard. One outstanding feature is the Problem of the Month which gives a monthly problem related to the standards which cause students to apply the skills. The problems have levels to challenge students at their own level. Detailed explanations are provided.