These cards have been super helpful to me to formatively assess where my students are in understanding the task at hand.
I printed and laminate one of each color for each student and put them on a ring. They keep them at their spot and have been taught to take them out and place it by their work.
This allows me to easily walk around the room and see who needs help. Bonus points, that our arms don’t get tired from holding them up trying to ask for help!