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Angela Just and Jennifer D. Cribbs

The authors outline the importance of using variety when teaching mathematics.

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Erin E. Baldinger, Matthew P. Campbell, and Foster Graif

Students need opportunities to construct definitions in mathematics. We describe a sorting activity that can help students construct and refine definitions through discussion and argumentation. We include examples from our own work of planning and implementing this sorting activity to support constructing a definition of linear function.

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Rebecca Vinsonhaler and Alison G. Lynch

This article focuses on students use and understanding of counterexamples and is part of a research project on the role of examples in proving. We share student interviews and offer suggestions for how teachers can support student reasoning and thinking and promote productive struggle by incorporating counterexamples into the classroom.

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Quick Reads: Posters: More Than Just for Looks

a good idea in a small package

Greisy Winicki-Landman and Christine Latulippe

Posters, commonly employed for decoration, can be used to introduce and practice new concepts and help assess student learning.