## The Locker Problem: An Open and Shut Case

### Abstract

"In this article, we discuss how we use teaching via problem solving to help us enact the Teaching Practices and support our students' learning and development of the Standards for Mathematical Practice. This approach involves selecting and implementing mathematical tasks that serve as vehicles for meeting the learning goals for the lesson. For the lesson discussed here, the learning goals are developing our students' understanding of number theory concepts (factors; multiples; greatest common factor, or GCF; and least common multiple, or LCM). Further, we seek to continue a yearlong goal of developing our students' problem-solving skills."### Comments

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