This document discusses best practices for 21st century classrooms. It notes that 21st century classrooms measure accuracy through problem solving and questions rather than just content. Learning is collaborative rather than competitive. Assessment focuses on performance and mastery rather than just tests. It emphasizes using all available resources, both digital and non-digital, to support learning. Key skills needed in the 21st century include life skills, innovation, technology skills, core subjects, themes, and professional development. Participatory teaching methods like group discussion and teaching others have much higher retention rates than passive lectures. Overall virtual classrooms with smart boards can create engaging 21st century learning environments.