Minnesota does not use the Common Core State Standards for Mathematics. The Minnesota Academic Standards for Mathematics are attached to this post. 2007_Standards_by_topic
This document is helpful for seeing how skills and concepts develop through the grades. If a child is not achieving a grade level standard, this document can help you determine the prerequisite skills and understandings that need to be acquired.
Another resource that will be helpful in learning more about the Minnesota Academic Standards for Mathematics, is http://scimathmn.org/stemtc/frameworks
For a very quick tour (1 minute, 15 seconds) of the site, watch this video https://www.youtube.com/watch?v=BO38NHkUUXo