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【缘起】众所周知:小学数学教材体系有两条线,一是有形的数学知识,这是明线;一是无形的数学思想方法,这是蕴含在教材每一个知识点之中的暗线,它被数学实践者誉为数学知识的精髓、灵魂。可见数学思想方法的重要性。“平行四边形面积计算”一课在图形面积公式教学中占据着承上启下的重要地位。这是学生第一次用转化的方法探索面积计算公式,而在探究过程中获得的数学思想对学生后继自
Origin】 【As we all know: primary mathematics textbook system has two lines, one is the tangible mathematical knowledge, which is clear line; one is invisible mathematical thinking method, which is implied in the textbook every point of knowledge of the dark line, which was math Practitioners hailed as the essence of mathematical knowledge, soul. Visible mathematic thinking method of importance. “Parallelogram area calculation ” lesson occupies an important position in the graphic area formula teaching. This is the first time students use conversion method to explore the area calculation formula, and in the process of inquiry obtained mathematical ideas on student successors