《长方形与正方形的面积计算》是学生理解了面积的含义和面积单位,学会了应用面积单位直接度量面积的基础上学习的,是学生第一次学习平面图形的面积计算(由度量演进到计算),长方形和正方形面积计算公式又是推导其他平面图形面积公式的基础,它提供了度量和计算面积的基本原理和方法。为了让课堂教学 “Area Calculation of Rectangles and Squares” is the student’s understanding of the meaning of area and area units. Learning how to measure directly the area of ​​an area based on unit area is the area for students to learn the first time. (From measurement to calculation ), And the formula for calculating the area of ​​a rectangle and a square is the basis for deriving the area formula for other plan areas. It provides the basic principles and methods for measuring and calculating the area. In order to teach in the classroom