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教学目标:1.在具体的情境中经历比例的形成过程,理解比例的意义,掌握组成比例的关键条件,并能正确的判断两个比能否组成比例。2.通过动手、动脑、观察、计算、讨论等方式,使学生自主获取知识,全面参与教学活动。3.通过探索国旗中蕴含的数学知识,渗透爱国主义教育。
Teaching Objectives: 1. To experience the formation of proportionality in specific contexts, to understand the meaning of proportionality, to grasp the key conditions of compositional proportions, and to be able to correctly judge whether the two ratios can constitute a ratio. 2. Through the hands, brains, observation, calculation, discussion, etc., so that students gain access to knowledge, full participation in teaching activities. 3. To penetrate patriotic education by exploring the mathematical knowledge contained in the national flag.