Collaborating on an Extension to a Little-Known Theorem
[Today's post is from Steven Fuchs, with whom I recently corresponded and whose enthusiasm was sufficiently infectious that I pressed him to share it here. --Scott]
One day late last spring, while teaching at St. Thomas High School in Houston, I noticed in a book a figure demonstrating Monge’s Theorem. (Don't look this up … Continue Reading ››What Does Rowing Have to Do with Teaching Mathematics?

Introducing the Dynamic Number Project

Revisiting a Childhood Addition Code with Sketchpad
Polar Graphing
- Choose Graph | Plot New Function.
- Use the Equation menu to choose r = f(θ).
- Type "c" (for "cos"), "2", and "th" (for "theta").
- Click OK.
- If your … Continue Reading ››
Cartesian and Polar Graphs
Exponential Harmony with Sketchpad
Last week was the fourth session of my spring Advanced Secondary Math Methods class at the University of Pennsylvania. Each year I assign a semester project in which groups of three students use lesson-study techniques—on a small scale—to create, test, refine, teach, evaluate, and document specific shared instructional products, composed of a (possibly multi-day) lesson … Continue Reading ››
A Swan Song for Sweet Karen Coe
Today I leave for my first proper vacation in a year and a half. Last time I took such a vacation, Key sold its high school textbooks to Kendall Hunt and transformed from a publishing company to a educational technology company. This time I just hope to survive the end of the world. 🙂 Before … Continue Reading ››
Pass the Candy! Sweetening the Study of Probability
As part of our guest blog series, we bring you another post from Kathryn Shafer. A former middle school and high school math teacher, Kathy is now an Assistant Professor in the Department of Mathematical Sciences at Ball State University, Indiana. She's done a variety of … Continue Reading ››