A scaling task that incorporates rectangular prisms can net an increase in students' geometric understanding.

Contributor Notes

Kathy E. Prummer, kathy.prummer@lposd.org, teaches seventh-grade mathematics at Sandpoint Middle School in Sandpoint, Idaho. She is interested in engaging students in tasks that develop them as deep thinkers, problem solvers, and communicators of mathematical reasoning.

Julie M. Amador, jamador@uidaho.edu, is an assistant professor of mathematics education in the Department of Curriculum and Instruction at the University of Idaho and is the director of the Idaho Regional Mathematics Center. Her research focuses on professional noticing practices of in-service and preservice teachers and lesson study in the mathematics classroom.

Abraham J. Wallin, wallin@uidaho.edu, is the Regional Mathematics Specialist for the Idaho Regional Mathematics Center at the University of Idaho. He is currently researching how the use of video clubs affect teacher practice.

(Corresponding author is Prummer kathy.prummer@lposd.org)(Corresponding author is Amador jamador@uidaho.edu)(Corresponding author is Wallin wallin@uidaho.edu)
Mathematics Teaching in the Middle School


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