Which One Doesn't Belong?

Routine: Students will determine which figure(s)/statement(s) they think do not belong and provide a justification. There is no correct solution, but rather students should be encouraged to use their knowledge of symmetry to figure out a reason why each shape may not belong. This routine will strengthen students skills in comparative thinking, connecting and communicating mathematical ideas, and critical thinking. The following site has been used as inspiration and as a reference: http://wodb.ca/

Click on the video link below to see this routine in action in a primary classroom.