Most of the first semester is spent investigating basic ideas and developing conjectures. Specific work with proof begins in Unit 2 where students solve logic puzzles that require deductive reasoning in their solutions. Equal emphasis is placed on writing a logical presentation of the solution. Students practice justifying solutions in problems with lines, angles, and triangles in units 3-5. Students practice proof with congruence and properties of figures in the second half of the course as well as do proofs with the ideas presented in each of these units.
Answers appear in bold print, as they do in the teacher version of the text.
Proof problems are identified by the domino icon. This game is the number version of the commercially available logic game called Master Mind. The object of the game is to figure out a secret number using as few guesses as possible . One person thinks of a two-digit number. The other players try to figure out what the secret number is by using some very specific clues.