Collection of 28 diverse mathematics problems across all grade levels, inviting contributions from educators.
Problems to Ponder provides 28 varying, classroom-ready mathematics problems that collectively span PK–12, arranged in the order of the grade level. Answers to the problems are available online. Individuals are encouraged to submit a problem or a collection of problems directly to mtlt@nctm.org . If published, the authors of problems will be acknowledged.
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Slack et al. (2025) studied this question.
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