In this lesson, third graders were asked how many degrees is a full rotation around a circle. After we gave students time and space to disagree, to make and test conjectures, and to explore, they reasoned about angle as turn and determined a full rotation is 360 degrees.

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### Amanda L. Cullen, Carrie A. Lawton, Crystal S. Patterson and Craig J. Cullen

Excerpts from discussion threads on the online MyNCTM community

### Enrique Ortiz

Example—This article describes the unusual algebraic thinking displayed by several students when they met The Chicken problem

### Kelsey A. Clarkson and Jennifer M. Tobias

Three high school classes use numbers lines, comparisons, arithmetic operations, and algebraic manipulations to investigate equivalence.

### Brandon G. McMillan and Theodore Sagun

This instructional activity gives teachers access to student thinking that can be leveraged to extend and connect their ideas.

### Wayne Nirode

Students use movement and tracing paper to determine sets of points that are equidistant from two points, from two intersecting lines, and from a line and a point not on the line.

### Megan H. Wickstrom and Matt B. Roscoe

During a middle school task, students compare the sizes of Lake Tahoe and Flathead Lake.

### Nickolaus A. Ortiz and Trina J. Davis

One prerequisite to implementing a holistic form of culturally relevant pedagogy is to plan spaces, opportunities, and lessons for making connections.

### S. Asli Özgün-Koca and Matt Enlow

In this month’s Growing Problem Solvers, we aimed to help students explore patterns where they pay attention to the mathematical structures behind those patterns.