What did we do today?

I'm going to begin something that is called scribe posting. This is a work in progress. What I would like is for students to comment and tell me what we learned today in class. So, whatever day you sign on, tell me what we learned that day in class. Try to remember the mathematical terminology we used and maybe a moment you had where you understood what I was saying! Mary Kate, you told me that you thought I taught the lesson well the other day-what did I do that worked for you? What doesn't work? Be respectfully critical!