Tag Archives: rectangles

Picture this

Posted on June 13, 2012 by Brent

Picture this! is a very cool interactive thingy, made by Jason Davies, intended to get students (or anyone, really) thinking about some interesting math. Go play around with it and see if you can answer any of the listed questions … Continue reading →

Posted in challenges, links, pattern, pictures | Tagged , , , | 6 Comments

17×17 4-coloring with no monochromatic rectangles

Posted on February 9, 2012 by Brent

Quick, what’s special about the following picture? As just announced by Bill Gasarch, this is a grid which has been four-colored (that is, each point in the grid has been assigned one of four colors) in such a way that … Continue reading →

Posted in open problems, pattern, people, pictures | Tagged , , , , , | 5 Comments

Chessboard counting: solutions and further challenges

Posted on March 30, 2009 by Brent

And now for some solutions to the chessboard counting challenges. The first challenge was to count the number of squares of any size on an 8×8 chessboard. The key here (as with many counting problems) is to break the problem … Continue reading →

Posted in challenges, counting, solutions | Tagged , , , , | 2 Comments

Chessboard counting

Posted on March 13, 2009 by Brent

I am currently doing a unit on combinatorics (the mathematical study of counting) with my precalculus students, and I was inspired to post a few counting-themed challenge problems for your enjoyment. (Also, it’s my spring break!) As you probably know, … Continue reading →

Posted in challenges, counting | Tagged , , , , | 10 Comments