【教材分析】《什么是面积》是北师大版三年级下册第五单元第一课时的内容,学习的重点是认识面积的概念,难点是建立面积的初步认知,会比较两个简单图形面积的大小并体会统一面积单位的必要性。本节课将利用先学后教,合作学习的方式引导学生理解面积的概念,掌握解决简单图形面积问题的常用 【Textbook Analysis】 What is the area is the content of the first lesson of the fifth unit under the third grade of Beijing Normal University edition, the focus of the study is to recognize the concept of area, the difficulty is to establish the initial awareness of the area will compare two simple The size of the graphics area and the need to understand the flat area of ​​the unit. This lesson will use the first after-school teaching, cooperative learning guide students to understand the concept of area, to solve the problem of simple graphics area commonly used