Puzzles for the Classroom

In my last post, I shared some generalities about puzzle creation. Today, I will zero in on the specifics of creating puzzles for the mathematics classroom. I will do this by way of analyzing some examples. Multiple PathsA characteristic of all classrooms is that they are constituted of students whose backgrounds and talents vary widely. … Continue reading Puzzles for the Classroom

More on Geometric Construction

(Previous posts on this topic.)I suspect that by far the most common introduction to geometric construction in US classrooms is a presentation by the teacher (or textbook) on various compass and straightedge construction techniques. "This is how you construct a perpendicular bisector. This is how you construct an equilateral triangle." And so on. "Now memorize… Continue reading More on Geometric Construction


Many students have weak arithmetic skills. Many teachers blame this on calculator use, but it is just as likely that the real reason lies elsewhere. For one thing, the teaching of arithmetic traditionally does not involve developing any understanding, so the learning is shallow and fragile. For another, students correctly feel that mindless arithmetic is… Continue reading Calculation

Geometry Boot Camp!

I will offer two workshops this summer (2017), at the Head-Royce School in Oakland, CA. Sign up for either or both!June 26-27: Hands-On Geometry (grades 6-10)June 28-30: Transformational Geometry (grades 8-11)If the times or locations don't work for you, I can offer a workshop for your school or district. Contact me directly.  I recommend attending… Continue reading Geometry Boot Camp!