No paper, no problem. No prep, no laminating. I love using Boomcards with my 4th grade class. The students love using boomcards becasue they get immediate feedback and if they are making mistakes they can seek help. Students will decide how many lines of symmetry a letter has by moving the line to the letter. My students loved it and it really helped them understand symmetry. Therer was a similar questions on the fourth grade New York State exam.