This department showcases students' in-depth thinking and work on previously published problems. The September 2012 problem scenario helps students build number sense and measurement sense. This problem would make a nice addition to observances Fire Prevention Week (October 6–12).

Contributor Notes

Marie Wright, mwright@riverschool.net, teaches third grade at The River School in Washington, D.C. She also works as the curriculum and learning specialist and enjoys teaching academics through hands-on, thematic curriculum.

Edited by Jane Wilburne, jmw41@psu.edu, who teaches undergraduate and graduate courses in mathematics and mathematics education at Penn State Harrisburg in Middletown, Pennsylvania. 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 at www.nctm.org/ tcmdepartments.

(Corresponding author is Wright mwright@riverschool.net)
(Corresponding author is Wilburne jmw41@psu.edu)
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