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一、背景与导读《给厨房选择铺砖方案》是北师大版三年级下册第四单元面积里的一个综合实践活动内容。本节课是在学生认识了面积的含义,体会并认识了面积单位,探索并掌握了长方形、正方形的面积公式并能根据公式计算出长方形、正方形的面积之后设计的实践活动。二、案例与设计片断一:回顾旧知、引入新课师:通过第四单元面积的学习,你学到了哪些有关面积的知识。生1:我知道了面积是与周长不是一回事,周长是一条线有长
First, the background and guide “to the kitchen choose to shop plan” is the third unit of Beijing Normal University, the fourth unit area of a comprehensive practice activities. This lesson is designed for students to understand the meaning of area, understand and understand the area of units, to explore and grasp the rectangular, square area formula can be calculated according to the formula rectangle, square area after the design of practical activities. Second, the case and design A fragment: a review of the old knowledge, the introduction of new class teacher: Through the fourth unit area of learning, what you learned about the area of knowledge. Students 1: I know the area is not the same thing with the circumference, the circumference is a long line