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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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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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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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Aina K. Appova

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

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A cartoon exploring a problem about salaries, wages, and percentages is coupled with a full-page activity sheet.

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James Metz

Students analyze football plays.

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Scott A. Brown

The traditional technique for converting repeating decimals to common fractions can be found in nearly every algebra textbook that has been published, as well as in many precalculus texts. However, students generally encounter repeating decimal numerals earlier than high school when they study rational numbers in prealgebra classes. Therefore, how do prealgebra students in the middle grades convert repeating decimals to fractions without using the age-old algebraic process (multiplying and finding the difference of two “stacked” equations) or without applying the precalculus approach of treating repeating decimal digits as an infinite geometric series?.

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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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A cartoon exploring a problem about negatives and positives is coupled with a full-page activity sheet.