Take a look at the two groups of shapes below. Both groups contain an equilateral triangle and a square. Now imagine that you showed students each group and asked them to identify the shapes. Do you think students would do equally well in naming the shapes in group A and group B? Continue Reading ››

A little over a year ago, the Museum of Mathematics opened in the heart of New York City. I blogged about the museum last January, and have since returned with friends and a class of community college students. One of my favorite exhibits at … Continue Reading ››

Today's guest post is from Marta Venturini, a PhD student in Mathematics Education at Simon Fraser University under a "Cotutelle Agreement" with the University of Bologna, where she's a PhD student in Mathematics. While looking for some tasks that would be suitable for Sketchpad, I found the “dog leash” problem in a March 2007 Continue Reading ››