一、问题描述人教版课标教材一年级数学下册有这样一道例题(如下图所示)。这一内容是20以内退位减法中有多余条件的应用题。让学生题甄别有用信息,选择相关联的条件解决问题,是本例教学的重点。下面是我的课堂教学实录。出示主题图和问题,让学生思考:还有几人没来?生1:还有7人没来。师:你是怎么知道的?生1:有16人来踢球,现在来了9人,还剩7人没 First, the problem description PEP Curriculum textbooks in the first grade math have such a book (as shown below). This content is less than 20 absent subtraction method in the application of the remaining conditions. Allow students to identify useful questions, select the conditions associated with the problem, is the focus of teaching in this case. Here is my class teaching record. Show thematic maps and questions for students to think: How many people did not come? Health 1: There are 7 people did not come. Teacher: How do you know? Health 1: There are 16 people to play football, now 9 people, 7 people left