Object: Students are asked to guess a Natural number ( 1, 2, 3, ...). They will write their guess onto a piece of paper (sticky pad works best). The winner is the person that guesses the lowest number that no other student has guessed.
Students put their guess and their name onto a sticky memo pad paper. The teacher collects the papers and sticks them to the blackboard forming a bar chart. The winner will be the student who has the only entry over the lowest number.
Teacher can discuss with students data collection, analysis using a bar chart, probabilities and game strategy.
Prizes enhance the game play.