Description: Assign each corner of the room a category related to a topic. Students write which category they are most interested in, giving reasons, and then form groups in those corners.
Math Example: The corners of the room are numbered 2, 3, 4, and 5. Students are divided into four groups, and each group is sent to a corner. The teacher then poses a problem whose answer is a multiple of 2, 3, 4, or 5. Students in a corner that is a factor of that number will move to a different corner. If the teacher calls out 6, students in the corners labeled 2 and 3 will move. The activity ends with a prime-number answer, and students return to their seats.