## Great Classroom Action

Bowman Dickson’s students discover the power rule:

This was laborious and took a ton of time in class, but by the end I felt like students really understood well the idea of a derivative. More importantly, were itching for an easier way to find it. They had all these great ideas that they were proposing, so it was easy to funnel their energy into the next phase.

Sarah (@mathequalslove) on random square root review:

Ten minutes before class was about to start, I had an epiphany. What if I made the number under the radical sign random and unpredictable?

Nico Rowinsky on the abstraction we call “a histogram”:

For the most part, as a class, we tried to organize, sort, structure, and then label our way into a graphical representation. The end product was a histogram of travel time intervals versus frequency. However, during one of my classes, I tried something a little different.

Ian Byrd writes up the best modeling task I’ve seen in months:

A practical application of multiplication is to quickly count large numbers of objects arranged in a pattern. And where do we see large numbers of objects arranged in an array? How about parking lots? As a Californian, the parking lot that stands out to me is Disneylandâ€™s enormous â€œMickey and Friendsâ€ structure.

I'm Dan and this is my blog. I'm a former high school math teacher and current head of teaching at Desmos. He / him. More here.