Love this idea of collecting a quick response, sorting through the answers and keeping the person anonymous by rewriting the solution. I also think the name, "My Favourite No" is really cute. The video presents it clearly and you can just tell that the teacher has built a trusting community of learners. I found this by reading the NCTM document, Principles to Action. Knew most of it already, but it had
https://www.teachingchannel.org/videos/class-warm-up-routine
https://www.teachingchannel.org/videos/class-warm-up-routine