This is a great review activity. I print out these sheets and hang them up around the room in alphabetical order. The current order is actually the answer key order. I assign a group to start with A and a another group to start with C, and the next group start with E, etc. alternating where the groups start. They should make it through all 16 problems, ending up where their group originally began if they did it correctly. I threw in a few tricky ones, to see if students are really paying attention and understanding the relationships and not just memorizing rules.