On March 7, two teams of educators met in Austin to teach a math lesson — and make history.

The teachers, Eleanor Vierling and Kaitlin Ruggiero, and Tim Livingston and Terrance O’Neil, taught a 20-minute lesson called “contemplate then calculate.” The teachers were participating in Chalkbeat’s first-ever Great American Teach-Off, an event at the SXSW EDU conference.

The goal of the Teach-Off, inspired by some of our favorite TV shows that celebrate the hidden craftsmanship in other professions, was to elevate the craft of teaching.

After both teams of teachers presented their lessons, there was a robust conversation on stage and on Twitter about the best moments.

Watch the entire Teach-Off here and then tell us your favorite moment using the hashtag #teachoff.