I stick a hula hoop to the white board, and write numbers around the inside of the circle to make a "clock". You can make little notches around the inside of the hula hoop to practice telling time to the exact minute, if you choose to, but I really like to use this to work with elapsed time. We rarely tell time to the minute when practicing elapsed time, so the prep for this lesson is minimal! Just keep your Judy Clock handy to allow the kiddos to manipulate the hands if they need to think it through before writing an answer on the board! I love it. The kids love it. It's a win-win situation!