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Anne Quinn

The paper discusses technology that can help students master four triangle centers -- circumcenter, incenter, orthocenter, and centroid. The technologies are a collection of web-based apps and dynamic geometry software. Through use of these technologies, multiple examples can be considered, which can lead students to generalizations about triangle centers.

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Hyewon Chang and Barbara J. Reys

Using Clairaut's historic-dynamic approach and dynamic geometry tools in middle school can develop students' conceptual understanding before they encounter formal proof in geometry.

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Justin T. Burris

Compare how third graders think mathematically when using virtual versus concrete base-ten blocks to learn place-value concepts.

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Kevin Phillippi

This department showcases students' in-depth thinking and work on previously published problems. The August 2012 problem scenario leverages back-to-school shopping advertisements for this real-life scenario about making purchases using discount coupons. To access the full-size activity sheet, go to http://www.nctm.org/tcm, Back Issues.

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Ann Bremner

Games and videos lend themselves to student engagement and learning, but how do teachers determine what is most beneficial to student learning? How can we effectively incorporate technology into our teaching of mathematics?

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Terri L. Kurz

Free, Web-based balance tools can help students visualize the concept of the equal sign as the pivot point of an equation.

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Brandt S. Lapko

Teachers share success stories and ideas that stimulate thinking about the effective use of technology in K–grade 6 classrooms. This article describes how students can use available technology to communicate and share their thinking in popular media formats.

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Kurt J. Rosenkrantz

Students say some amazing things. Back Talk highlights the learning of one or two students and their approach to solving a math problem or prompt. Each article includes the prompt used to initiate the discussion, a portion of dialogue, student work samples (when applicable) and teacher insights into the mathematical thinking of the students. In this month's episode, a six-year-old rising first grader uses a computer simulation to understand addition and subtraction on the number line.

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Jennifer Orr and Jennifer Suh

Teachers share success stories and ideas that stimulate thinking about the effective use of technology in K—grade 6 classrooms. One way to keep young students engaged and interested in practicing counting is to involve them in using cameras. This article explains how first graders capture 100 images, use Windows MovieMaker or PhotoStory to turn the still images into a video, and then narrate a story using precise math vocabulary to explain their mathematical thinking.

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Kelly S. Chrisler

To better prepare students for their future careers, a fifth-grade teacher designs and implements a lesson that uses spreadsheet software to graph functions.