The document discusses key geometric concepts that should be taught in early elementary grades, including two and three dimensional shapes, coordinate geometry, transformations, symmetry, and spatial reasoning. It provides rationale for why geometry is important even at a young age. Several hands-on activities are described to help students explore and develop an understanding of these foundational geometric ideas in a developmentally appropriate manner through exploration and play.

1. Developing and Assessing Geometric and Measurement Concepts By Michelle Flaming

48. Student Interviews