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1.

Thanksgiving Quilt [electronic resource]

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Creating quilt squares from construction paper, first graders develop spatial sense as they discuss and handle different shapes. They connect geometric ideas to number ideas as they cut squares into congruent triangles. NCTM standards: geometry and spatial sense, patterns and relationships, communication, and connections.
Online
1997
2.

Pattern Blocks [electronic resource]

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Second-graders learn the mathematical terms for pattern-block pieces: hexagon, trapezoid, square, triangle, and rhombus. Ideas about fractions emerge as students spot size relationships between shapes. Covers the following NCTM standards: geometry and spatial sense, number sense and numeration, reasoning, and connections.
Online
1997
3.

Shapes From Squares [electronic resource]

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A second/third-grade class develops spatial sense as they subdivide and change squares to create different shapes. The language of geometry grows naturally from their explorations. Covers the following NCTM standards: geometry and spatial sense, communication, and reasoning.
Online
1997
4.

Polygons and Angles: Discovery [electronic resource]

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The teachers tackle hands-on activities to investigate angle measurements and their relationships in triangles, quadrilaterals, pentagons, and other polygons.
Online
2000
5.

Polygons and Angles: In Practice [electronic resource]

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In this follow-up to Workshop 5, the teachers discuss how they taught the polygon lessons in their classrooms, learn to evaluate student work, and design new lessons.
Online
2000