留个缺口,这是教师的一种智慧,创设了一个让学生能打开天窗说亮话的空间,学生顺应缺口启迪思维,进行深层的思考,这不是残缺,而是一种更高层次的圆满。一、留个“缺口”给学生,让学生有探究的空间在教学“平行四边形面积的计算”时,大部分学生都认为平行四边形面积的计算方法是用底乘高,并介绍了自己的验证方法 (剪拼法)。惟独有一学生提出了一个十分有价值的问题,他觉得平行四边形的面积也是用长乘宽,理由是平行四边形容易变形,可以转化成长 To leave a gap, which is a kind of teacher’s wisdom, to create a space for students to open the window to speak brightly, students adapt to the gap inspired thinking, deep thinking, this is not incomplete, but a higher level of success. First, to leave a “gap” to the students, so that students have room for exploration in the teaching of “parallelogram area calculation,” most students agree that the area of ​​the parallelogram is calculated using the bottom multiplier, and introduced My own verification method (cut spelling). However, a student alone posed a very valuable question. He thought that the area of ​​the parallelogram is also long and wide on the grounds that the parallelogram is easily deformed and can be transformed into long