In this month's problem, students are presented with a scenario in which two friends are planning a summer vacation. The students must use measurement concepts to compare two lakes to determine what bigger means with respect to the lakes and which of the two lakes is bigger. Each month, elementary school teachers receive a problem along with suggested instructional notes and are asked to use the problem in their own classrooms and submit solutions, strategies, reflections, and misconceptions to the journal audience.
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J. Matt Switzer, firstname.lastname@example.org, is an assistant professor of mathematics education at Texas Christian University (TCU) in Fort Worth. His research interests include preservice teacher education, early algebra, learning theory, learning trajectories, and identification of and interventions for students struggling in mathematics. Edited by Sarah Quebec Fuentes, also an assistant professor of mathematics education at TCU. Each month, this section of the Problem Solvers department features a new challenge for students. Readers are encouraged to submit problems to be considered for future columns. Receipt of problems will not be acknowledged; however, those selected for publication will be credited to the author. Find submission guidelines for all departments at http://www.nctm.org/tcmdepartments.