Kaprekar’s constant
September 29, 2014, 12:00 amA student talked about Kaprekar’s constant (6174) during their my favorite presentation.
Really cool.
Steps (from wikipedia):
- Take any four-digit number, using at least two different digits. (Leading zeros are allowed.)
- Arrange the digits in descending and then in ascending order to g...
Euclid GCD
September 25, 2014, 12:00 amDarker pixel = longer Euclidean algorithm to find GCD(x,y). Here x & y range from 1 to 500. So many questions… pic.twitter.com/k8N6jiGxSd
— Matt Enlow (@CmonMattTHINK) September 24, 2014
I saw this toot by Matt yesterday morning and I loved the visual of the color based on the number of...
My Favorite for the Students
July 29, 2014, 12:00 amLet me know if these are things that interest you as a teacher of children:
- You want the students to find your subject interesting.
- You want the students to investigate your subject in their own time, like an adult would do.
- You want the students to continue to develop their presentation ski...
Lizard Grow
July 29, 2014, 12:00 amMy son was given this lizard as a big brother gift (can’t find online link to product, but here’s a similar toy).
Thoughts?
Original Size
Size After 2 Day Soak
Before Measurements
Left image
Length: 905 pixels
Width (between front feet): 275 pixels
1 inch: 90 pixels
Right image...
M&M’s Mega
May 30, 2014, 12:00 am
"'M&M's Mega' To Have Three Times More Chocolate." Oh brother here we go again. http://t.co/zrBE5tZ3Al /cc @dandersod
— Dan Meyer (@ddmeyer) May 16, 2014
3x the Chocolate?
What a great Calculus activity (hint: rotational volumes).
Cross sections with an exacto:
M&M
M&M Meg
...Daily Desmos 3.0
May 27, 2014, 12:00 amHello all, we’re looking to reinvigorate the Daily Desmos project and we’re looking for new contributors (and that means you!). We’re taking away the schedule and the numbering system so you can submit posts directly to DD whenever you’d like. You can still submit images via email, but we’re go...
Feedback On My Feedback System
May 19, 2014, 12:00 amCareful SBG, the all seeing eye of pershauron is trained on you: http://t.co/S6QAJz1p86 c/o @mpershan
— Dan Anderson (@dandersod) May 19, 2014
In response to the Dark Lord Pershauron, I’ve decided to see what feedback you all have for my current SBG setup (v 5.0).
The course is Pre-Ca...
Bedouins Breaking Bread
May 17, 2014, 12:00 amHow did the magistrate recommend that the two bedouins divide the money?
Money Duck
May 11, 2014, 12:00 amThis is a crosspost from my 180 photo blog.
Introduction
If you haven’t read Dan Meyer’s take on the Money Duck, go ahead and read up.
Here’s some classroom action:
Act 1
I presented the Money Duck to my PreCalculus H classes. We were in the midst of probability and we were moving to...
Edward Frenkel on Math and Beauty
April 9, 2014, 12:00 amEdward Frenkel, author of Love and Math, was on The Colbert Report.
Here’s a transcript of an especially interesting segment:
Edward Frenkel: When you say that you hate math, you’re really saying I hate the way math was taught to me. Imagine you’re in art class in which they only teach yo...