These quiz cards have 24-hour or a 12-hour time on one side and the equivalent time on the other, allowing students to learn while having fun. The handy folding design means you don't need to fiddle around with trying to line up double sided printing. You just print, trim the edges, fold them in half, glue them, and then cut the cards apart and you are ready to roll. These cards are great for cooperative learning whole class games. I love Kagan games, especially Quiz-Quiz-Trade. They are a terri