Originally published in August 2011, the Windows problem presents opportunities for students to think in terms of groups and nudges them toward thinking multiplicatively as they determine the number of windows on the side of a building. To access the full-size activity sheet, go to www.nctm.org/tcm, Back Issues.
Edited by Drew Polly, email@example.com, an assistant professor in the Department of Reading and Elementary Education at the University of North Carolina in Charlotte. Each month, this section of the Problem Solvers department discusses the classroom results of using problems presented in previous issues of Teaching Children Mathematics. Find detailed submission guidelines for all departments by accessing www.nctm.org/tcmdepartments.