My coworker and I try to make sure we keep the students going with a sense of urgency by using our phones as timers. We find it good for pacing and to make sure how much time we have spent on a given task. This is an example of doing so while students were working on using triangle congruence theorems. Remember geometry? It's fun!
I am a math teacher in the New York Department of Education. I infuse technology and real-world problems into my curriculum in order to prepare my students for the future. I would love for people across the country to recognize we teachers can't do it alone. If you don't believe me, come visit my classroom!