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Steve Ingrassia and Molly Rawding

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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Beth L. MacDonald, Diana L. Moss,, and Jessica H. Hunt

In this article, we explore how playing with dominoes not only requires students to count but also to subitize when constructing number and operations.