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Sarah B. Bush, Karen S. Karp, Jennifer Nadler and Katie Gibbons

By examining ratios in paintings and using a free educational app, students can size up artists' use of proportional reasoning in their creations.

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A cartoon exploring a problem about order of operations is coupled with a full-page activity sheet.

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Kami M. Dupree

Abandon mnemonics and make stronger connections between the operations and properties of arithmetic.

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Samuel Otten and Andrew Otten

Students make strategic choices–and justify them–to solve a system of two linear equations.

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Nicole Panorkou and Alan P. Maloney

Develop fifth-grade students' early expression of pattern relationships through instructional tasks.

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Elana Reiser

Use popular culture to draw students' attention to mathematical topics.

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Michael Weiss

Core content provides opportunities to focus on the structure of mathematical theory, proof, and anticipation of subsequent topics.

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Sonalee Bhattacharyya, Nama Namakshi, Christina Zunker, Hiroko K. Warshauer and Max Warshauer

This activity engages students in problem solving while exploring key concepts of number theory, such as divisibility and divisibility tests, place value, fractions, and scale factors.

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Matt B. Roscoe and Joe Zephyrs

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

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Marla A. Sole

Using bivariate data, students investigate the ingredients in pasta sauce.