Exploring the Characteristics of Classroom Introductions by Young Junior High School Mathematics Teachers: Evidence from a National Video-Based Teaching Competition

Based on instructional video cases from the 13th National Junior High School Young Mathematics Teachers' Exemplary Lessons, video analysis methodology was Employed. This study investigates the structural elements and implementation characteristics of classroom introductions in junior high school mathematics education. The analysis focuses on six dimensions: characteristics, duration, methods, media, scenarios, and functions of classroom introductions. The findings reveal that outstanding young teachers demonstrate professional awareness in rationally controlling introduction time, applying media three-dimensional, and comprehensively fulfilling the functions of introductions. However, room for improvement remains. To enhance the effectiveness of introductions and improve teaching quality, practical recommendations are proposed for frontline educators: ensuring concise and efficient introduction time, employing vivid and diverse media, and designing scientifically feasible introductory scenarios.