Divide and Assign
Team building not only improves the productivity of work assigned to a group, but also ensures self development, leadership skills, improves communication, and increases one's ability to listen to others and work closely as a group to solve a problem. You can divide kids into two groups and assign a task (it could be project work or some art work). In this way, team members identify their strengths and weaknesses, and channelize them in the right direction as a group, for best results.