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Developing Teachers’ Knowledge of a Transformations-Based Approach to Geometric Similarity

Nanette Seago, Jennifer Jacobs, Mark Driscoll, Johannah Nikula, Michael Matassa, and Patrick Callahan 

September 2013, Volume 2, Issue 1, Page 74

Abstract:
U.S. students’ poor performance in the domain of geometric transformations is well documented, as are their difficulties applying transformations to similarity tasks. At the same time, a transformations-based approach to similarity underlies the Common Core State Standards for middle school and high school geometry. The authors argue that engaging teachers in this topic represents an urgent but largely unmet need. The article considers what a transformations-based approach to similarity looks like by contrasting it with a traditional, static approach and by providing classroom examples of students using these different methods.

Keywords:
Article
Video
Professional Development / Teacher Education
Transformations

Mathematics Teacher Educator is co-published by the National Council of Teachers of Mathematics and the Association of Mathematics Teacher Educators.