One way in which geometry teachers can help students develop their reasoning is by providing proof-readiness experiences. Blum and Kirsch (1991) suggest that "preformal proofs" can help students develop deductive reasoning. Preformal proofs, which follow the basic principles of deductive reasoning, can help prepare students for formal deduction in proof and develop an understanding of the power of formal proof in mathematics. This article discusses two activities that help students reason deductively from facts to a conclusion: conclusion quickies and mystery problems. Geometry teachers can use these activities early in the year to give students experience in using deduction and proof. Students learn to focus on important facts, reason from those facts to a conclusion, and then offer supporting reasons or proof for their conclusions. (Contains 2 figures.)