As a pre-k teacher center management is very important. I created center signs that include how many students are allowed in each center. The students have their own apple with their name and picture on it. When it is their turn to choose a center they put their apple on the center sign. The students quickly learn how many students are allowed in each center and where to place their names.
I laminate the pages and use Velcro for the students to place their names on the numbers!