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Dana C. Cox and Jane-Jane Lo

Incorporate simple and complex figures, distortion and proportion, and visual reasoning into your discussion of similarity.

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Dana C. Cox and Michael Todd Edwards

How do middle school students interpret the phrase “two sizes too small”? Examining students' responses will re-form your thinking about teaching similarity and using nonstandard shapes.

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Suzanne R. Harper and Dana C. Cox

Emphasizing the process rather than the produced solution, the Kaleidoscope task inspires students to create an artifact for further reflection and discussion.

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Michael Todd Edwards, Suzanne R. Harper and Dana C. Cox

The Meeting for Lunch problem exemplifies how standards provide more than an outline of daily activities for an entire school year.

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Michael Todd Edwards, James Quinlan, Suzanne R. Harper, Dana C. Cox and Steve Phelps

This approach to determining measures of angles fosters stronger understanding of formal proof.