At the February GeT Seminar, Justin Dimmel made a compelling case for the use of light from the sun and stars as a naturally occurring context to study the geometry of parallel lines. One outcome of his work has been the ongoing development of a mathematical tool called the SunRule. By combining the geometry of […]

“Social interaction provides us with the opportunity to use others as resources, to share our ideas with others, and to participate in the joint construction of knowledge.”(Smith & Stein, 2011, p. 1) The rapid transition to online instruction in the spring forced many instructors to develop remote learning strategies that sacrificed high-quality instructional practices out […]

As the call to teach mathematics through collaborative problem-solving reaches a wider audience, more secondary school teachers are grappling with the difficulties inherent in facilitating learning through problems. Open problems provide opportunities for students to engage in authentic disciplinary practices such as formulating and evaluating conjectures, considering the costs and affordances of various problem-solving approaches, […]