I added the core of a unit on complex numbers to the Algebra 2 page.Like some other materials I've written over the years for my students at the Urban School of SF, these lessons were inspired by the pioneering work of Stein, Crabill, and Chakerian (see their out-of-print Algebra II/Trig book.)From the intro to the… Continue reading Complex Numbers
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12-month leave
I recently started a 12-month leave from teaching. This may give me some time to add materials to this site. I've prioritized the many items on my list, so you may see them appear as time permits. If you have requests, now is a good time to let me know!I just uploaded a slightly updated… Continue reading 12-month leave
The Final Frontier
I updated the page on my Space post-algebra 2 advanced geometry elective. I added a fair amount of additional details based on this year's iteration of the course.I also gave a talk about the course today, which suffered from a bit of a tech meltdown at the end, as I had trouble going back and… Continue reading The Final Frontier
Logo Math
I removed the book / software package Logo Math: Tools and Games from my publications page, as it has been out of print for some time.The vision it manifested, articulated in "The turtle in the age of the mouse", is nearly defunct as well -- I know of no currently available programming language that can… Continue reading Logo Math
Showing Work
From a correspondent: "I recently came across a math teacher that has a policy of providing a "zero" on any math homework assignment where the student does not show his/her work. The math teacher has informed the building principal that showing the work, i.e., the process is required for the student to learn math. This… Continue reading Showing Work
Teaching Proof
Last summer, I taught a workshop on "Hands-On Geometry", as part of the Center for Innovative Teaching. It was successful in some respects, but the participants were almost unanimous in letting me know I had not managed to get across the "authentic approach to proof" I had promised in the course description. Part of the… Continue reading Teaching Proof
Abstract Algebra update
I'm not sure how this happened, but the abstract algebra PDFs were missing some graphics, and the pagination was off. I fixed that.(I'm currently teaching this material in my Space class. Big fun!)--Henri
Speaking at CAIS
I'll be speaking about my Space class at the California Association of Independent School meeting in Oakland in March. I added a mention of that to my Talks page, and to my résumé.I'll give the talk again at the NCTM meeting in DC this April.See you in Oakland, or DC!--Henri
Teacher Collaboration
I posted a new version of slides on teacher collaboration on my Teaching page.I had created the original version with Jonathan Howland (Dean of Faculty at the Urban School) about five years ago, for an audience of independent school leaders. Today, I presented a (slightly) new version to a group of math teachers and department… Continue reading Teacher Collaboration
Lab Gear still in "print"
Some correspondents have had trouble ordering Lab Gear. As far as I can tell, based on info from Creative Publications, the only thing that is not available is the "Middle School Class Set". But other configurations should still exist.Let me know if you find out differently!--Henri
Henri's Math Education Blog 