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Observations on the PARCC sample Geometry exam

Part 1: Observations on the PARCC sample Algebra I exam Part 2: Observations on the PARCC sample Algebra II exam Part 3: Observations on the PARCC sample Geometry exam Calculator part: 18...


[Makeover] Central Park & These Tragic “Write An Expression” Problems

Previously: [Makeover] These Tragic “Write An Expression” Problems tl;dr. I made another digital math lesson in collaboration with Christopher Danielson and our friends at Des...


“I would eat the extra meatball.”

Simon Terrell recaps his lesson study trip to Japan with Akihiko Takahashi, who was the subject of Elizabeth Green’s American math article last week: In one case, a teacher was teac...







Twitter Math Camp 2014 Keynote

Two quick meta-items about blogging from the last week: I attended Twitter Math Camp 2014 in Jenks, OK, in which 150 math teachers who generally only interact online get together in perso...






From Lisbon to Prague

A plane, three trains, various buses and tubes, and I have been translated from Lisbon to Prague. Time to celebrate with some eye candy perhaps: from here to here: Prague is beautiful too...


Poe on algebraists

Michael Kinyon reminded me of Edgar Allan Poe’s comments on algebraists in his story “The Purloined Letter”. Here they are in full. “But is this really a poet?R...




Rand Paul Fixes Calculus

Rand Paul: If you have one person in the country who is, like, the best at explaining calculus, that person maybe should teach every calculus class in the country. It’d be helpful i...






[Makeover] These Tragic “Write An Expression” Problems

We need to do something about these problems, which recur all throughout school Algebra. The original title of this post called them “horrible,” but they’re truly “...