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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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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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Darlinda Cassel and Dan Vincent

One of the more challenging aspects of trying to integrate technology into the classroom is finding phenomenon-based activities that can be enriched by technology applications. This article describes a mathscience-technology activity combining students' collection of data with mathematical and scientific analysis that is enhanced by using the iPod Touch (iTouch). The activity focuses on measuring shadow lengths throughout the school year and then organizing and evaluating the data by using the Planets app on the iTouch. Although this particular lesson was created for fifth graders, it could be adapted for students in other grades as well.

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Jennifer Suh and Padmanabhan Seshaiyer

Foundational in understanding place value and our decimal number system, this concept is explored through a practiced-based activity designed to develop teachers' technology knowledge for teaching mathematics. The activity focuses on number sense using online applets and various related models and representations.