Math Circles is an approach that can be immediately used in your classroom.  It is a flexible model.  Originally, it was developed for a third grade classroom, but has also been used in fourth grade.  When presented to K-8 professionals, many teachers saw how they could customize the main Math Circles template to meet the variety of needs present in their classrooms.  Review some basic ways to begin the approach in Getting Started.  Download and customize Math Circles Templates and Math Circles Assessment Templates.