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Ryota Matsuura and Yu Yan Xu

This activity involves finding the distance between two points in a coordinate plane and emphasizes reasoning from repeated calculations, which is one of the mathematical practices specified by the Common Core State Standards for Mathematics.

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Chris Bolognese

The treasure hunt takes my classroom to the world and features a variety of approaches, conjecture building, and the use of dynamic geometry software. The problem has been written about extensively (Gamow 1947; Nahin 2016; Shilgalis 1998; Shriki 2011). Here is the problem as I have adapted it for my students.

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Alyson E. Lischka, Natasha E. Gerstenschlager, D. Christopher Stephens, Jeremy F. Strayer, and Angela T. Barlow

Select errors to discuss in class, and try these three alternative lesson ideas to leverage them and move students toward deeper understanding.

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Jordan T. Hede and Jonathan D. Bostic

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

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Stephan Pelikan, Anna F. DeJarnette, and Stephen Phelps

A monthly set of problems is aimed at a variety of ability levels.

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Joel Amidon and Matt Roscoe

A monthly set of problems is aimed at a variety of ability levels.

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Lisa Englard

A regular department of the journal that features collections of short activities focused on a monthly theme, Math by the Month articles aim for an inquiry or problem-solving orientation that includes at least four activities each for grade bands K—2, 3–4, and 5–6. This issue considers how children's toys and games offer many opportunities to count, compare numbers, look for patterns, explore the coordinate plane, and investigate fractions and ratios.