Divide the class into 4 teams 2. One representative from each team stands at the board with chalk and a paper taped to the board which covers up the team member's answer until it is called for 3.
Teacher selects an item to estimate.
Team members who are still sitting at their seats can shout out numbers to help the contestants. The contestant coming closest stays up for round 2 while other contestants are replaced by new team members. I have presented this game at Science Teacher Conventions since the early 1980's. Net Web Services sm , a division of Teachers Web sm . All Rights Reserved.