This book rounds out a pair of unusual activity books designed to heighten awareness of international perspectives on mathematical education. Activities in both books showcase topics discussed at the International Congress on Mathematical Education (ICME-12) in Seoul, South Korea, July 2012. This book features activities for students ages 13-18, whereas the companion book features activities for students ages 5-13. Different countries give different meanings to and have different ideas about an "activity." The activities in this book remain fundamentally true to the original, although the...