1.深入了解,把握学习起点。在教授《9加几,几加9》这部分知识前,我通过调查了解到有一小部分学生已经会用进位加法算式,一大部分学生能够利用学具试着算一算。了解到这些情况,有利于我根据学生年龄特点和本班学生的具体情况,引导学生进行自主探究。2.细心引导,提供探究空间。当 1. In-depth understanding, grasp the starting point for learning. Before I taught “9 plus, plus 9,” I learned through surveys that a small percentage of students had already used the carry-in-addition formula, and most of the students were able to use the learning tools to try their luck calculations. Understanding these situations will help me to guide students to conduct autonomous inquiry according to the characteristics of their ages and the students in their class. 2. Carefully guide to provide space for inquiry. when