前景提要:提到“平行四边形的面积”课,相信小学数学教师会很熟悉。我参加工作14年,对于讲了50余节,听过百余次的这一内容,更是如数家珍!很多上公开课的教师都愿意选这节课,因为这节课好上,无非按照“产生需求——大胆猜测——动手验证——总结应用”来进行设计;不做公开课的教师也愿意上,因为正常教学讲到这节课不需要太多的备课就可以开讲。我认为这节课是好上,但很难 Prospect: Referring to the “Parallelogram Area” class, I believe primary school mathematics teachers will be familiar with. I participated in the work of 14 years, for about 50 sections, heard over a hundred times this content, it is all the more! Many teachers in open class are willing to choose this class, because this class is good, nothing more than “Producing Requirements - Daring Guessing - Hands-on Verification - Summating Applications” for design; teachers who do not do open classes are willing to go because normal teaching tells you that this lesson does not require much preparation. I think this lesson is good, but hard