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周长、面积、体积达三部分内容既有联系又有区别。开始教周长，学生还易掌握；进入教面积时，如果没有处理好它们之间的联系和区别，就无法准确地掌握这部分内容，这将为体积教学带来困难。所以，一开始就要帮助学生分清长度和面积的概念、长度单位和面积单位的概念；在明确周
Perimeter, area, volume up to three parts of both the contact and the difference. Begin to teach the perimeter, students are also easy to grasp; into the teaching area, if they do not handle the connection and the difference between them, can not accurately grasp this part of the content, which will bring difficulties for the volume of teaching. Therefore, from the very beginning, students should be helped to distinguish the concept of length and area, the concept of length unit and area unit;