Crossword Puzzle: A Touch of Math

Here is an original 15×15 crossword puzzle I constructed, called “A Touch of Math“.

A Touch of Math 2011 – Patrick Honner

I would rate this puzzle as easy, suitable for those without much puzzling experience.

As the title suggests, you don’t need any special mathematical knowledge to complete this puzzle.  All of the long clues, and a few short ones, are math-related, but by no means is it entirely mathematical (constructing such a puzzle would be extremely difficult!).

Try it yourself, and feel free to use it with your students.

Math Quiz: NYT Learning Network

Through Math for America, I am part of an on-going collaboration with the New York Times Learning Network.  My latest contribution, a Test Yourself quiz-question, can be found here:

http://learning.blogs.nytimes.com/2011/05/23/test-yourself-math-may-23-2011/

This question is based on the rise in popularity of “internet sweepstakes cafes” in Florida.  How much revenue are these casinos generating every year?

Fun With Folding: Centroid

Here’s another entry from my Fun With Folding series:  folding the centroid of a triangle!  The centroid of a triangle has a lot of interesting properties, most notably serving as the center of mass of the triangle.

To fold your way to the centroid, use the midpoint fold three times to construct midpoints of each side of the triangle.  Then, fold the line through each vertex and opposite midpoint.  (Click here to find instructions for these basic folds.)

Like magic, all the medians intersect at the centroid!

Be sure to try some other fun mathematical activities with folding!

Have more Fun With Folding!

Fun With Folding: Circumcenter

Here’s another entry from my Fun With Folding series:  folding the circumcenter of a triangle!  The circumcenter of a triangle is the center of the triangle’s circumscribing circle.

To fold your way to the circumcircle, use the perpendicular biscctor fold three times to construct the perpendicular bisector of each side of the triangle.  (Click here to find instructions for these basic folds.)

Like magic, all the perpendicular bisectors intersect at the circumcenter!

Be sure to try some other fun mathematical activities with folding!

Have more Fun With Folding!

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