An easy (and affordable) way to check in with students. Cards are color coordinated so they can even be used in younger grades.
Print out on the appropriate color and hole-punch in the corner and add a book ring. When checking in with students they can easily choose which color and have them hold it up, or ask them to flip it to the color accordingly for a check in and have them keep it on their desks. Easy way to see visually where students are in their work.