In finishing up their chapter on logic and reasoning, Geometry classes played the board game Clue. They had learned that conditional and contrapositive statements are logically equivalent. (Contrapositive statements switch and negate the hypothesis and conclusion of the original conditional. For instance, the contrapositive statement for “If today is Saturday, then it is the weekend.” is “If it is not the weekend, then today is not Saturday.”) The students enjoyed the chance to use this type of logic playing Clue as they questioned other players and determined the person, weapon and room involved in the crime. Another favorite activity in this chapter was solving logic puzzles.