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    NCTM Illuminations
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    In this math lesson, learners create parallelograms from square sheets of paper and connect them to form octagons. During the construction, learners consider angle measures, segment lengths, and...

    1 cent - $1 per student Ages 11 - 18 1 to 2 hours
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    PBS
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    In this math lesson, learners arrange pattern blocks to create tessellations and to explore geometric patterns. Learners first explore making patterns with a variety of pattern blocks. They next...

    free Ages 11 - 14 45 to 60 minutes
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    PBS
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    In this math lesson, learners use hinged mirrors to discover that regular polygons are composed of triangles tessellating around a center point. Learners then sketch these triangles on paper models...

    1 cent - $1 per group Ages 8 - 11 1 to 2 hours
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    The Exploratorium
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    In this activity, learners work together to make polygons (many-sided shapes) with string. Learners sit on the floor and hold onto a piece of string slid between their thumbs and index fingers....

    1 cent - $1 per group Ages 4 - 8 30 to 45 minutes
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    The Exploratorium
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    In this activity, learners walk the sides and interior angles of various polygons drawn on the playground. As they do so, learners practice rotating clockwise 180° and 360°. Learners discover there...

    1 cent - $1 per group Ages 11 - 18 5 to 10 minutes
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    PBS
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    In this two-part math lesson, learners investigate problems that foster algebraic thinking across content strands. In the first part, learners explore even and odd numbers linked to quilts....

    1 cent - $1 per group Ages 8 - 11 1 to 2 hours
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    The Exploratorium
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    In this activity, learners follow simple directions to explore and create platonic solids. Learners count the number of faces, edges, and vertices in the structures they make out of paper and look...

    1 cent - $1 per student Ages 11 - 18 30 to 45 minutes
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    PBS
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    In this math lesson, learners identify the relationship between the number of sides in a regular polygon and the number of struts needed to make each polygon rigid. Learners build polygons using...

    $1 - $5 per group Ages 8 - 11 45 to 60 minutes