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• Geometry
• Conceptual Development
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## Quilt Block Symmetries

Pull on the threads of congruence and similarity in a series of lessons that explores transformational geometry.

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## Hook and Hold

Set sail to explore powerful ways to use anchor charts in mathematics teaching and learning.

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## Untangling Geometric Ideas

This geometry lesson uses the work of abstract artist Wassily Kandinsky as a springboard and is intended to promote the conceptual understanding of mathematics through problem solving, group cooperation, mathematical negotiations, and dialogue.

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## Connecting the Threads of Area and Perimeter

See how sixth-grade students design and create quilt squares for this geometry project.

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## The Mathematics of Tiling

People who lay tile for a living use mathematics every day to decide how much tile, grout, and other supplies are required to complete each job. Measurement and geometry are an integral part of designing tile patterns. Collections of short activities focus on a monthly theme that includes four activities each for grade bands K–2, 3–4, and 5–6 and aims for an inquiry or problem-solving orientation.

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## Using Constructed Knowledge to Multiply Fractions

Observe fourth graders' thinking in action as they connect the multiplication of whole numbers to arrays.

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## Helping Young Children See Math in Play

Capitalize on opportunities for mathematical concepts to emerge in common preschool contexts, such as doll corners and block centers.

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## The Functionator 3000: Transforming Numbers and Children

Be inspired by a formerly timid third grader who now confidently conveys a new understanding of numbers, patterns, and their relationships as functions.

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## Norms and Mathematical Proficiency

How do classroom behavioral expectations support the development of students' mathematical reasoning? A sixth-grade teacher and his students developed this example while discussing a ratio comparison problem.

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## Derivative of Area Equals Perimeter—Coincidence or Rule?

A familiar relationship—the derivative of the area of a circle equals its circumference—is extended to other shapes and solids.