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“正比例的意义”是在学生具有比和比例的知识及常见数量关系的基础上进行教学的,着重让学生理解它的意义。正比例关系是比较重要的一种数量关系,学生理解并掌握了这种数量关系,可以加深对比例的理解,并能应用它解决一些简单的有关此类的实际问题。同时通过本节课的教学可以进一步渗透函数思想,为学生今后学习中学数学和物理、化学打下基础。它是小学阶段学生所要学习的最后一个重要的新知领域,也是孩子学习时感觉比较困难的一个概念。在教学时应注重对比,让学生在不断的对比中突破难点,自主建构正比例的概念。
“Proportional Meaning ” is to teach students on the basis of the ratio and proportion of knowledge and the number of common, focusing on the students understand its meaning. Proportional relationship is a more important quantitative relationship, students understand and grasp the quantitative relationship, can deepen the understanding of the comparison, and can be applied to solve some simple practical problems on this class. At the same time through the teaching of this lesson can further penetrate the function of thinking for students to learn the secondary school math and physics, chemistry lay the foundation. It is the last important area of new knowledge that elementary school students want to learn, and it is also a concept that children feel more difficult when they study. In teaching should focus on contrast, so that students continue to break the difficulties in contrast, independent construction of the concept of proportionality.