面积的概念和面积单位是学习面积计算的前题和基础.虽然,学生对长方形的图形特征有了初步认识,但对面积概念的学习只是开始.为了使学生很好地理解面积和面积单位的意义,教学时,要注意观察、比较、分析、综合.通过直观教学,逐步归纳出抽象概念. The concept of area and the unit of area are the prerequisites and foundations for the calculation of area of ​​learning.Although students have come to a preliminary understanding of the rectangular graphic features, the study of the concept of area is only the beginning. In order for students to have a good understanding of area and area units Significance, teaching, we should pay attention to observation, comparison, analysis, synthesis through intuitive teaching, and gradually sum up abstract concepts.