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.
Towards Inquiry: A few suggestions on specific steps one can take to enhance classroom discourse, and thus student understanding.
Updates to my Math Education Page
Make your own Pentominoes: I added a laser cutter file (made by Eben Lapier) to my site. You can download it from my Geometric Puzzles page, where I explain why laser-cut pentominoes are preferable to the commercially available ones. The same page, of course, links to lots of puzzles for the classroom.
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.
Left or Right?: I tweaked and linked to this activity which can serve as review or assessment of understanding of y = mx + b. Answer without actually graphing: given these two linear functions, do the lines meet to the left or to the right of the y-axis?
What else is new
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.
26 November 2019: I restored the graphics in my post Completing the Square.
30 October: I sent out my e-newsletter. The main topics were test retakes and a response to Freakonomics Radio episode about math education. I also highlighted recent contributions to my blog and website by Rachel Chou.
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!
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
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.
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.)