“错误”是走向“正确”之路的阶梯。教师在教学中应敢于直面错误,在倾听、思考、提升、评价中,进行适当的点拨、引导,让学生发现错误中的闪光点,在这过程中体会到“山穷水尽疑无路,柳暗花明又一村”的学习快乐。北京版第5册《周长的认识》教学片断:在明确周长概念的基础上,探究一个半圆的周长是几厘米,目的是进一步深化理解周长的概念。同学们选择自己喜欢的工具进行测量,有的组用线绳和直尺量,有的用软尺 “Error ” is the ladder to the “right” path. In teaching, teachers should dare to face the mistakes, and make proper guidance and guidance in listening, thinking, improving and evaluating so that students can find the bright spot in the mistakes. During this process, teachers will realize that “ One village ”learning pleasure. Beijing version 5 “Peripheral Recognition” piece of teaching: a clear concept of perimeter on the basis of exploring the circumference of a semicircle is a few centimeters, the purpose is to further deepen the understanding of the concept of perimeter. Students choose their favorite tool to measure, and some groups with rope and ruler volume, and some with a soft ruler