3-2-1: an admit or exit ticket idea

3-2-1--
tell students: write down 3 things you learned, 2 questions you still have, and 1 connection you'd like to share--or
3 similarities between . . . , 2 predictions about . . . , 1 something else---
the 3-2-1 topics can be anything, and if they are related to the lesson, the next day's work, the unit theme, etc. so much the better