Cut out a bunch of shapes out of construction paper and hide them around the classroom. Be sure you know how many total shapes there are so you know when they've all been found. Then have students group the similar shapes together.
Hidden shapes
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.
Math Resources
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FloridaMath.com aims to provide valuable math teaching resources for instructors and parents alike. Founded by a practicing third grade math teacher, it was constructed as a place for people to come together and share math teaching ideas. Since practicing instructors contribute to this website, the math teaching resources you will find here are both relevant and applicable.
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