Aug 13

Factors + Dancing

This is a mesmerizing visualization of the prime factorization of the natural numbers. If you go to Stephen Von Worley’s site Data Pointed you get the full experience along with the ability to pause and skip forward and back. It would be very interesting to give these diagrams to students and see if they could produce a next in series diagram. If they could do that, the diagrams could be used as a way to introduce primes and prime factorizations.

Factor Diagram

I stumbled on it via Teq another great blog.

Aug 13

Glam Calculator


I was in a Mazda dealership buying a new car the other day when the service manager broke out this rhinestone beauty. I think I lost my negotiating position at that point. I started asking her about it. She said the best thing about it is that it is the first calculator that the other (male) sales associates wouldn’t steal off her desk.

Jul 13

Relationships and Education

There isn’t much of an argument here, but I love this talk. It echoes my basic sentiment about education: relationships matter. Whether you are using tech or chalk, classic or reform mathematics find and nurture those relationships. Why? Can I get away with “it just feels right”?

Jul 13

Circle the Cat Game

Screen shot 2013-07-23 at 3.03.30 PM

Ready to lose whatever time remains in your work day? This cute little cat will mess with you. Good luck in Circle the Cat.

Jul 13

Building Estimation Skills

Estimation 180 is a great site for building estimation skill. I can see using this at the beginning of class to stimulate thought. Best of all the site works great on mobile devices.


Jul 13

Launch Your Own School (for free)

This is crazy. There are no shortage of sites that let you set up and manage a class online for free. Eduongo is a site that lets you set up and manage your own SCHOOL. Imagine opening your own school being as easy as starting a blog. I have no idea how good Eduongo’s platform is, but it is a clear continuation of a trajectory of digital education. It is only a matter of time before there are others. I’m not sure whether to be excited or afraid? Check out their promo video below.

Jul 13

Math Vocabulary

One thing that I notice is particularly hard to impart in my online classes is mathematical vocabulary. My online students can be very technically proficient in key skills without being able to talk about them very well. I always notice this when they come in for office hours and we’re talking about a particular problem. I’ve been brainstorming different ways to develop vocabulary remotely. Here is my latest. I’m not sure what the name for these are. (Guessing: pictogram?) But we’ve all seen these in different games. You have a series of pictures indicating a word. See if you can guess these? And let me know what you think of the exercise.



Jun 13

Math Trail

Math Trail is a really interesting idea. It is an math themed scavenger hunt using google maps. There are different hunts you can do and they are centered on different mathematical themes. Check out the demo.

via Free Tech for Teachers

Jun 13

Curious Units

Units have been going through my mind a lot lately. I ran into this on Futility Closet. It made me speculate what a Hendree unit might be? Doesn’t everyone deserve a unit named after them? Any suggestions?

Jun 13

Great Video Sources for Math

Free Technology for Teachers has put together a nice list of video resources for math teachers. You’ll see a couple like Numberfile that I link to often.