I created this for my own classroom to organize re-teaching and extension groups for interventions but it could be used to organize math centers as well. The first page is for teacher use. The second page could be used for student-self evaluation or could be projected from a document camera to show student which groups they will be working in. The squares are the size of sticky notes so that you can write student names on stickies to use this page for multiple skills. You could also laminate the page and write on it with Expo markers.