Recent Blog Posts

Teaching the Distributive Property: A guest post by Rachel Chou, on the importance of non-examples in solidifying student understanding.

Freakonomics Radio on Math Curriculum: My response to the latest contribution to our discipline from a well-intentioned but poorly informed outsider.

Retakes vs. Test Corrections vs. Neither: In which I argue in favor of test corrections, done as homework, for “points”.

Links to all the posts!

Updates to my Math Education Page

Off and On / Add Till It’s Plaid: Two lessons that illustrate ax + by = c through possibly unfamiliar activities: what does ax + by add up to for a generic point (x,y) somewhere in the plane? what happens visually when we add or subtract a pair of equations in this form? I used video to present the core of the lessons. I also added an Off and On applet so you and your students can conduct that experiment using an equation of your choice.

Stairs: This is a beginner’s “rise over run” activity which I designed ages ago for TI calculators. Later, I attempted a Desmos version, which (perhaps due to my lack of expertise) had various issues. I replaced it with a GeoGebra applet, something I knew how to make.

Number Pyramids: I added a puzzle-solving and puzzle-creating activity for upper elementary and middle school, mostly based on the addition of whole numbers.

All Math Education Page Updates

What else is new

5 October 2019: Along with Kim Seashore, I was a presenter at Lessons from Lew, a free professional development session. We shared Lew Douglas’s lessons on angles, the golden ratio, symmetric polygons, and more. Links to an expanded version of the handouts, here.

18 September 2019: I added a link to Chris Bolognese’s Desmos Activity Builder version of Add Till It’s Plaid, a lesson plan on solving systems of linear equations.

23 August 2019: I sent out my e-newsletter. The main topics were: “Taking Notes vs. Doing Math”; a review of a book that was a big influence on my teaching; the place of puzzles in math education. Plus a lot more. Subscribe!

Old 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.)