人教版教材四年级上册第四单元“平行四边形与梯形”练习十二中有一道判断题,题目是:两个高相等的平行四边形拼在一起还是平行四边形。四年级学生还没有学过平行四边形的面积,怎样让学生理解题意,作出判断,做到知其然还知其所以然?笔者通过对两个班不同的教学进行对比,引发了思考。【A班教学过程】出示题目,学生读题,理解题意,独立思考。汇报时全班有 PEP textbook fourth grade on the fourth unit “parallelogram and trapezoid ” exercise twelve have a judge, the question is: two high equal parallelogram together spell or parallelogram. Fourth grade students have not yet learned the area of ​​parallelograms, how to make students understand the meaning of questions, make judgments, knowing that they still know why? The author of two classes through different teaching, triggered thinking. [A class teaching process] to produce the title, students read the questions, understand the questions, think independently. Reported when the class has