Print on index cards and cut in half. Set of 24 information questions. There are 24 corresponding answers. Print 1 set of answer cards for every 3-4 students. Spread answers out on desk face up. The teacher has the questions and reads them 1 at a time. The student who slaps the correct answer gets that card and earns 1 point. Long version: only 1 student in entire class gets card; teacher asks same question again later. Short version: 1 student per group gets card.