Jeannetta Mitchell asks her students to watch videos in class. That may sound counter-intuitive -- why have them watch a video when she's right there?
Because, as both she and her students put it, sometimes they understand on the third try, or when it's explained differently. "There's more than one way to solve something," Mitchell says.
It's also important to note that students aren't watching videos for the entire class time -- they watch the videos intermittently, between solving problems on the board and working in groups, and answering Mitchell's questions.
Here's a short video by Lenny Gonzalez showing what that looks like.