My daughter's kindergarten teacher has an activity set up with muffin pans but I think you could also probably use egg cartons. She'll include a set of small objects like marbles, buttons, or beans, and then have the children group the objects by 2,3,4,5, etc., using the muffins to help the kids keep the grouped objects separate.
Using Muffin Pans to help young kids group objects
K - Kindergarten

1 - First Grade

2 - Second Grade
        
3 - Third Grade
                  
4 - Fourth Grade
        
5 - Fifth Grade

The grade level links above will take you to the Sunshine State Standards math expectations. Each expectation also includes a printable student activity.
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