In prior Carnivals of Mathematics it has been a tradition to include trivia about the number the Carnival happens to be at in some way. With a desire to do something different for Math Teachers at Play, I offer a riddle. Younger solvers may have an advantage over older ones here.
Here is a pair of dice I own:
If I roll the dice and read the numbers off the top, is it more likely the numbers add up to be 2, or add up to be 12? Or are the two sums equally likely? Why?
Be careful before you answer!
Elementary Concepts and Arithmetic
Kendra has come up with a new game for teaching the reading of clocks. (The RummiKub variant is intriguing.)
The blog yofx gives a vacation photo of an unusual example of negative numbers in real life.
Many look at multiplication tables and see drudgery; Dan MacKinnon sees rainbows and hyperbolic arcs.
When you go to the pediatrician, do you notice mathematical error-correcting codes? Mark Dominus does.
Pat Ballew notes how one quadratic in particular can serve as a “graphic catalog” for all possible quadratics.
Dave Richeson finds complexity in even the simplest geometry and shares three cool facts about rotations of the circle.
Foxmaths 2.0 performs an clever bit of calculus on the function .
About Teaching Math
Want to keep your kids thinking about math over the summer? Kate Nowak is full of ideas at Math around the House.
Maria Miller reviews an online math practice system called Mathletics.
Tom DeRosa wants a TV show that changes the way we think about math.
Colleen King wonders if learning programming should be mandatory in education, and gives concrete suggestions for all the different grade levels.
Want to post math equations on Blogger/Blogspot like you’ve seen on WordPress? WatchMath has a solution.
Speaking of typesetting equations, John Cook owes Microsoft Word an apology.
This post about struggling with dyscalculia is a worthwhile read.
Finally, this is a series that appeared back in 2008, but it was new to me, so I hope it is new to some of you! Ron Doerfler wrote a three-part series on “lightning calculators”, people who can do astounding mathematical calculations in their head: The Players, The Methods, The Media. Especially fun (in part 3) is the deconstruction of a Daniel Tammet documentary and its “creative” editing.