Create one big clock face with movable hands. Place on the bulletin board. Create cards with different times written on them. Show the answer on thee back of the card with a simple sketch. Make a pocket to put these cards in, as well as another pocket to put the finished cards in. Students will pick a time, show it on the clock, and then check their answer. You can also do addition and subtraction of times as well as different time zones for more advanced students.