Resources and Tools for Elementary Math Specialists and Teachers

Common Core State Standards for Mathematics

Grade(s) 1 resources related to the following standard:
Reason with shapes and their attributes.
1. Distinguish between defining attributes (e.g., triangles are closed and three-sided) versus non-defining attributes (e.g., color, orientation, overall size); build and draw shapes to possess defining attributes.

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In this geometry lesson (4-page PDF) students explore properties of 2-dimensional shapes, including concave versus convex polygons, by working in groups with a loop of string.
Activity, Lesson Plans
Grade Level: K, 1, 2
This article helps educators answer questions about geometric thinking and the activities that develop it. It outlines the 3 levels of thinking about shape and space and the 5 phases of activities known as the van Hiele model. The tangram puzzle provides a vehicle for describing these phases and the types of thinking students achieve in each one. The article concludes with a suggestion about followup activity.
Reference Materials, Article
Grade Level: K, 1, 2, 3, 4
Resource is part of a PD collection