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Stephan Pelikan, Anna F. DeJarnete, and Stephen Phelps

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

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E. Fanny Sosenke and Tala Councilman

A real-world problem about the cost of moving one's household from one city to another.

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Carolyn James, Ana Casas, and Douglas Grant

Encouraging students to justify earlier as they attempt to solve an open-ended task can lead to greater understanding and engagement.

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Kasandra Dickman and Laura Bofferding

This department explores a game used to help students learn about additive inverses, or “zero pairs.” Authors describe some common reasoning that students used while playing the game and provide activity sheets geared toward students in grades 5–7.

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Courtney Starling and Ian Whitacre

Introduce your students to a fun and innovative game to encourage precise communication

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Erin Turner, Amanda T. Sugimoto, Kathleen Stoehr, and Erica Kurz

Research-based strategies are described for supporting students as they mathematize real-world scenarios and create inequalities to model situations and contexts from their own lives.

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Priya V. Prasad

Assess the robustness of students’ understanding of polygons and move students beyond drawing to constructing geometric shapes.

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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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Patterns on a Calendar

big solutions to little problems

Jo Ann Cady and Pamela J. Wells

Solutions to a previous Solve It problem are discussed, and the procedures used with problem solving are explored.

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Aina K. Appova

Students analyze the probability of receiving a lifetime of free coffee.