and Operations

Number of players: 4
Materials: Spinners
What Do We Have in Common?  

Label equal sections of one spinner "12," "18," "24," "36," "42," "54." Label equal sections of a second spinner "14," "16," "20," "28," "35," "60."

Work in pairs. In turn, one partner from each pair spins a spinner. The other two group members compete to be the first to name the greatest common factor of the two numbers on the spinners. The partner who correctly names the greatest common factor first gets 1 point. Continue, trading roles each time, until one pair has earned 5 points.