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Wendy B. Sanchez and David M. Glassmeyer

In this 3-part activity, students use paper-folding and an interactive computer sketch to develop the equation of a parabola given the focus and directrix.

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Michael J. Bossé, Kathleen Lynch-Davis, Kwaku Adu-Gyamfi and Kayla Chandler

Teachers can use rich mathematical tasks to measure students' conceptual understanding.

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Heather Lynn Johnson, Peter Hornbein and Sumbal Azeem

A computer activity helps students make sense of relationships between quantities.

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A set of problems of many types

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Arsalan Wares

A paper-folding problem is easy to understand and model, yet its solution involves rich mathematical thinking in the areas of geometry and algebra.

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Devon Gunter

A hands-on approach to studying quadratic functions emphasizes the engineering design process.

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A set of problems of many types

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Larry Lesser

Short items from the media focus mathematics appropriate for classroom study.