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【教学内容】人教版数学三年级下册第109页。【课前思考】等量代换是指一个量用与它相等的量去代替,它是数学中一种基本的思想方法,也是代数思想方法的基础。新的课程标准中明确提出,推理是数学的核心思想之一,而等量代换的思想正是推理思想的下位思想,也正是应用基本推理而得出结论的过程,因此本节课对于培养学生的推理能力能起到很好的作用,让学生主动经历知识的建构过程,从而使学生的主体地
Teaching content】 【PEP Teaching mathematics third grade volume 109th page. [Pre-class thinking] Equivalent substitution refers to an amount to replace it with an equal amount, it is a basic way of thinking in mathematics, but also the basis of algebraic thinking method. The new curriculum standard clearly put forward that reasoning is one of the core ideas of mathematics, and the idea of equivalent substitution is just the inferior idea of reasoning, which is also the process of applying basic reasoning to draw conclusions. Therefore, Training students reasoning ability can play a very good role in allowing students to take the initiative to experience the construction of knowledge, so that the students’