《长方形、正方形周长的计算》这节课是上海市义务教育小学三年级第二学期的教材,本节课的内容主要是帮助学生理解计算长方形、正方形周长的方法,使学生会计算长方形、正方形的周长,解决一些生活中的实际问题。本课的教学对象是小学三年级的学生,他们正处于由具体形象思维向抽象逻辑思维转变的时期,他们能进行一定的抽象思维,但仍以形象 “The calculation of the rectangle and the circumference of the square” This course is the second semester of the compulsory primary school in Shanghai. This lesson mainly aims to help students to understand the method of calculating the circumference of a rectangle and a square so that students can calculate the rectangle, The perimeter of the square solves some of the practical problems in life. The teaching object of this course is the third grade students in primary school. They are in the period of changing from concrete imagery to abstract logical thinking. They can carry out some abstract thinking but still use the image