The Trammel of Archimedes traces an ellipse as the machine’s lever is rotated. Specific measurements of the machine are used to compare the machine’s actions on GeoGebra with the graph of the ellipse and an ellipse formed by the string method.
The Do Nothing Machine
Using Mathematics to Design a Droid
George J. Roy, Matthew Cunningham, and Kenneth Rafanan
Teachers have the opportunity to make mathematics relevant. We leveraged the popularity of Star Wars to engage students in exploring and connecting two dimensions and three dimensions to careers in toy design.
Algebraic Thinking in the Context of Spatial Visualization
Arsalan Wares and David Custer
This pattern-related problem, appropriate for high school students, involves spatial visualization, promotes geometric and algebraic thinking, and relies on a no-cost computer software program.
Turning Trucks Into a Meaningful Geometry Exploration
Kate Roscioli and Jennifer Suh
Learn how to engage students in geometry concepts through a real-world task that leverages GeoGebra to provide students with generalization and authorship opportunities.
Exploring Grades 3–5 Mathematics Activities Found Online
Lara K. Dick, Amanda G. Sawyer, Margaret MacNeille, Emily Shapiro, and Tabitha A. Wismer
We investigate resources on TeachersPayTeachers and discuss how what is available affects our teaching practices.
Developing Skills with Visual Representations
This article describes how visual representations can help develop students’ reasoning and proof skills.
A Radian Angle Measure and Light Reflection Activity
During a Desmos activity, students adjust the measures of angles in radians to reposition a laser and a mirror so the beam passes through three stationary targets. The Radian Lasers activity can be extended to simulate project-based learning.
Building Powerful Mathematical Thinkers with dINBs
Courtney K. Baker, Terrie M. Galanti, Kimberly Morrow-Leong, and Tammy Kraft
The Teaching for Robust Understanding framework facilitates online collaborative problem solving with digital interactive notebooks that position all students as doers of mathematics.
Empowering Latinx Families to Help Children with Mathematics
Sabrina De Los Santos Rodríguez, Audrey Martínez-Gudapakkam, and Judy Storeygard
An innovative program addresses the digital divide with short, engaging videos modeling mathematic activities sent to families through a free mobile app.
Everybody Still Plays: Virtual Engagement without Webcams On
When learning is virtual and students’ webcams are turned off, the ways that we interacted in an in-person classroom fall short. These six strategies for hearing from all students during whole-group instruction and small-group work honor students’ need to keep their webcams off.