- MAA Minute Math (which has a new problem each weekday) had this problem on Monday: The volume (V), surface area (S), and total edge length (L) for a cube are consecutive terms in an arithmetic sequence. The largest possible side length is a+sqrt b (a,b integers). Find a+b.
- NUM+BER=PLAY, quite a bit harder than the ones that repeat letters/digits.
- 930 impossible figures.
- 37 pounds of garbage (kindergarten math)
- Rebecka's students loved their matrix-encoded scavenger hunt.
- Ashli is reading lots of interesting research. "The policy of requiring a passing score on an Algebra II exam for high school graduation simply cannot be justified."
*Math for Writers*is free for download, today and tomorrow.- The tides of the quadratic formula. (What can you do with this?)
- Math and quilting, geogebra fun with John Golden.
- The current issue of Nautilus (an amazing online journal) is on symmetry. This issue includes a chapter a week for five weeks. This week's chapter is called 'In Theory', and includes articles on Penrose tiles and fair sharing.
- A primer on Newton's Laws, that starts out by emphasizing how counter-intuitive they are. (Physics, not math, but physics is the reason for calculus, right?)
- Megan Schmidt loved how engaged her students were with Nrich's Digit Doozy problem. I also like their largest product problem. I think I'll put a bunch of their posters up in the math lab in August.
- Bon Crowder says the "summer slide" is a myth. I concur. Let's
*play*with math this summer. - A puzzle posed as a card game.
- Tantalizing intro to 'The mirror crack'd: why physics is lopsided'. I'd like to read this, but I don't have a subscription. Bummer.
- Graphing game from John Golden.
- Why do math? from Siam, describes how math solves problems. Includes a description of google page rank (though it's not very in-depth).
- A and a half. How an Oregon Trail simulation demonstrates the problems with standardized tests.
- Engaging students in learning the multiplication facts, up to 20 times.

Crazy, how much good stuff there is to read. How can anyone absorb all this?

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