当前的教育由关注教师精彩的课堂教学聚焦到了学生精彩的课堂学习,这一趋势在2011年数学新课程标准改革后愈加明显,但在注重学生的过程中也暴露了一些缺陷。一是有些教师驾驭课堂能力尚缺,课堂上不能做到及时反馈,放开来又收不拢,以致时间不够草草收场。二是学生自主学习能力不够,课堂反馈不足,学习效率不高。笔者在教学中也曾多次遇到过此类问题。如在执教人教版三年级上册“估计”一课时,也曾放手让 The current education focuses on the excellent classroom learning of students by paying attention to the wonderful classroom teaching of teachers. This trend became more apparent after the reform of mathematics new curriculum standards in 2011, but some defects were also exposed in the process of focusing on students. First, some teachers still lack the ability to control the classroom. In the classroom, timely feedback can not be achieved and they can not be reconciled to each other. As a result, time is not enough to end slowly. Second, students lack of self-learning ability, lack of classroom feedback, learning efficiency is not high. The author has repeatedly encountered such problems in teaching. As taught in the third edition of PEP “estimation” class, also let go