Recent Blog Posts

No One Way: Where I argue that my motto for this blog is not just about pedagogy. It is about math itself!

Minimum Polyomino Cover: A problem from recreational math which I thought about decades ago, and again in the past few days.

Asilomar Report: Conic Sections. I presented twice (Lessons from Lew, and Connect the Dots), and I attended two sessions about conic sections. I share what I learned and provide useful links.

Links to all the posts!

Updates to my Math Education Page

Geogebra files: Many GeoGebra files on my site would not open. Some of them are associated with applets — I fixed those some time ago. I have now fixed the remaining ones. From now on, all the .ggb files you download from should open normally.

Summer Workshop: This is the page about Hands-On Geometry, my 2020 summer workshop for middle school teachers. It will be hosted by Atrium School near Boston, July 21-23 and Synapse School in Silicon Valley, Aug 4-7.

Fraction Arithmetic on Grid Paper: I drastically expanded this page, adding details, graphics, and five homemade videos. One big idea, with many uses across that domain.

All Math Education Page Updates

What else is new

10 February 2020: I sent out my e-newsletter. Topics included guided inquiry, conic sections, a polyomino puzzle, a grid approach to fractions, graphing ax+by=c, and number pyramids. Also: an announcement of my summer workshop — Hands-On Geometry on both coasts. Alas, there was a wrong date for the latter, and a couple of broken links. It’s all fixed online!

4 February 2020: Infinity is a mind-bending topic that everyone finds interesting. I shared infinity paradoxes, puzzles, problems, and proofs from a high school course I developed at the Berkeley Math Teachers’ Circle.

7 December 2019: At the Asilomar conference, Kim Seashore and I presented Lessons from Lew. (Kinesthetic angles, Golden Ratio, Symmetric Polygons.) Later, I presented Connect the Dots, an extravaganza of geoboard / dot paper activities for ages 9 to 99: curricular challenges, interesting puzzles, and some unsolved problems.

Other News

27 November 2018: I moved my blog into WordPress (here.) I thought the move had happened smoothly, but some graphics, and some entire posts, failed to materialize. Also, many links are broken. If you come across these problems, please notify me, indicating which post had the issue. Thanks!

Henri Picciotto

I have retired from the classroom after 42 years as a math teacher in K-12 — from counting to calculus. I now work with teachers and schools:
    Math Education Consulting

I share instructional materials on my Math Education Page, and my views on math education on this blog

On this page: announcements about new material, updates, etc. on the site; new publications; my appearances at conferences; and my other activities in math education.


My Résumé

Note: All material on this site is copyrighted. You may reproduce it for any non-commercial purpose, as long as you credit me and link to the blog. More info.

(I am also involved in word puzzles, especially cryptic crosswords.
More on this.)