In preparation for my Asilomar talk, I have updated all my function diagram Java applets to HTML 5.What that means is that (a) you won't get the annoying and scary message warning you of the dangers of Java, (b) the applets will work on a tablet, and (c) you won't need to have GeoGebra installed… Continue reading HTML 5!
Tag: MySite
"Enrichment"
During my first ten years as a teacher, I worked in elementary schools. In addition to team teaching my own class (grade 3, then 4, then 5) I was a math specialist for grades K-5. The basic idea was that there was "normal" math (a lot of arithmetic, textbook-based), and there was "enrichment" math. I… Continue reading "Enrichment"
Crowd-Sourcing
Well, not much of a crowd, because not many people read this blog. Still... I created four worksheets of sorts, each one consisting of a short title and images of a dozen circles. Each circle is divided pizza-like into slices, as in the example above. The four titles: Angles, Fractions, Time, and Percents/Money. Here is… Continue reading Crowd-Sourcing
Parabolas and Quadratics in GeoGebra
I've added several GeoGebra files to my Parabolas and Quadratics page. Some are self-explanatory, others will probably only make sense if you download and familiarize yourself with the accompanying curriculum materials.GeoGebra users may be interested in my use of the very powerful "Sequence" command in creating the trinomial.ggb file. This command allows interactive geometry to… Continue reading Parabolas and Quadratics in GeoGebra
New Transformational Geometry Page
I've added a Transformational Geometry page to my Web site. I expect it will grow over the next year, as I get further into this and develop new ideas and materials. (See also my earlier post on transformational geometry, which generated an interesting response.) --Henri
Interactive Geometry Software
Some years ago, I started using interactive geometry software. My application of choice was Cabri, because I appreciated its mathematical depth and the elegant simplicity of its interface. I developed a number of Cabri-based activities, many of which you can find on my Web site. For example:function diagrams, the geometry of the parabola and ellipse, factoring… Continue reading Interactive Geometry Software
"A New Algebra"
About twenty years ago, along with Anita Wah, I wrote "A New Algebra", a paper for the Journal of Mathematical Behavior (JMB). It was an attempt to address what I saw as a crucial issue in secondary math education: on the one hand, the traditional Algebra 1 course was the gateway to any further work… Continue reading "A New Algebra"
Transformational Geometry, cont’d.
As I mentioned in a recent post, I will be one of the presenters at the Bay Area Math Project's summer workshop on Transformational Geometry. As part of preparing for this, I went through my notes, and compiled a sort of syllabus of the relevant lessons from my Space course. Symmetry and transformations are the… Continue reading Transformational Geometry, cont’d.
Subscribe!
I finally figured out how to make it possible for you to subscribe to this blog via e-mail. (Look to the right!)If on the other hand, you only want to get e-mails from me once in a blue moon, read this post.--Henri
Transformational Geometry
One of the features of the Common Core content standards in secondary school is a change in the foundations of geometry. Instead of basing everything on congruence and similarity postulates, as is traditional, the idea is to build on a basis of geometric transformations: translation, rotation, reflection, and dilation. This is an interesting change, but… Continue reading Transformational Geometry
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