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Math For Real:The Half-Lives of Medicines

when will I ever use this?

Alyssa Hoslar

Calculating a half-life, the approximate time it takes for the body to remove one-half the active ingredient in a medicine, provides the real-life tie-in to this activity.

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Diana L. Moss and Lisa Poling

Students explore the mathematics found in chocolate production.

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Redeem Reasoning

readers speak out

Kuo-Liang Chang

This opinion piece discusses how simplicity, ease, and efficiency—in the guise of shortcuts, tips, and packed procedures—kill mathematical reasoning.

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Alfinio Flores and Melina D. Priewe

Students explore multiplicative comparisons and the meaning of remainders using their own concrete representations, including orange wedges.

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Kami M. Dupree

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

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Casey Hord and Samantha Marita

Support math conversations and teach students to approach various problem-solving tasks by encouraging the use of tables.

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Juli K. Dixon and Jennifer M. Tobias

Anticipate and address errors that arise when fractions are placed in context and illustrated with models.

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James Metz

Students analyze how many trees are used to produce toilet tissue.

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

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