This math activity focuses on elapsed time. The activity involves a set of cards in which each card has an answer to another card and a question to be asked and answered. The activity is done together with a group of students. All of the cards are passed out to the students. A student is chosen to begin the activity by reading the question on his or her card. The students must figure out the answer. Then the student who has the answer on their card responds with the answer. That student then reads the question on his or her card. The activity continues until all of the questions have been asked and answered.