Practice of Large Unit Teaching of “Triangle” in Junior High School Mathematics—Taking “Congruent Triangles” as an Example

随着《义务教育数学课程标准(2022年版)》中“大单元教学”的提出，大单元教学成为数学教学改革的重要方向。它要求教师更加注重数学知识间的整体化与逻辑化，教师要深入挖掘相关知识体系的内在联系，助力学生全面发展。基于该背景，本文对大单元教学进行介绍与价值探讨，并以全等三角形判定教学为例，构化出“三角形”大单元的教学框架，详细阐述基于大单元教学下的教学设计和实施过程，从而促进学生进一步理解和学习全等三角形，帮助学生深度学习。With the introduction of “large unit teaching” in the “Compulsory Education Mathematics Curriculum Standards (2022 Edition),” large unit teaching has become an important direction for mathematics education reform. It requires teachers to focus more on the integration and logical structure of mathematical knowledge, delving into the intrinsic connections within relevant knowledge systems to support students’ all-round development. Against this backdrop, this paper introduces and discusses the value of large unit teaching, using the teaching of congruent triangle criteria as an example to construct a “triangle” large unit teaching framework. It elaborates on the instructional design and implementation process under large unit teaching, thereby promoting students’ deeper understanding and learning of congruent triangles, assisting them in achieving deep learning.