Just download the file below and print on green, yellow, and red card stock. The GREEN is for students who totally understand the concept, YELLOW for students who kind of understand and RED for students who don't understand. To increase the functionality, I also printed the letters A, B, and C on the back in case I want to use them for a quick multiple choice response. (You may want to laminate for durability. I plan on doing it when I get to school, but I wanted to share them with you today.) Then, punch a hole in the top corner and connect the 3 cards with a metal book ring. If you have the typical student desks you could use a string or ribbon to connect the ring to one of the metal bars on the desk. I have permanent lab tables, so I am going to use ribbon to connect them to the base of the gas valves or base of the sink faucets that are on the student lab tables.
Enjoy the FREE printables and let me know how it goes!!