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“梯形的认识”一课,我已教了好几回了。不外乎从直接测量梯形的两组对边的特征得出梯形的概念。但如何在教学设计上创出点新意,使学生对梯形的表象更清晰、更牢固地掌握,总结起来,大体有以下两方面的收获。一、精选感知材料1.选直观、典型的材料教材上说:水渠的横截面是梯形。以前,我不管学生懂不懂,照本宣科按教材意思讲一句,就把它滑过去了。然而,学生对“横截面”的理解是很肤浅的,由于没有感性认识,加上知识的抽象性,学生难以理解,为了帮助学生弄懂,教学时,我特地买了一个大的白萝卜,
“Trapezoidal understanding of” a lesson, I have taught several times. Nothing more than from the direct measurement of trapezoidal two pairs of edge characteristics derived trapezoidal concept. However, how to create something new in teaching design so that students can grasp the appearance of trapezium more clearly and firmly, and sum up the following two aspects in general. A selection of perceived material 1. Select the visual, typical materials, said: aqueduct cross-section is trapezoidal. In the past, I did not know the students do not understand, according to the textbooks to say a word, it slid over. However, the students' understanding of “cross-section” is superficial. Due to the lack of perceptual knowledge and the abstraction of knowledge, students find it difficult to understand. To help students understand and teach, I specially bought a large white radish,