The Standards for Mathematical Practice are standards that apply across all grade levels and refer to the most productive ways students will encounter and use mathematics rather than to the content they will learn. The first link below is to the formal language of the standards.  The second link explains the standards in more parent-friendly terms.

 

http://www.corestandards.org/Math/Practice/

 

http://www.wismath.org/Resources/Documents/Annual%20Conference/124MButturini-Parent_MathNight%20Handout.pdf