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长方形、正方形面积计算是学生接触多边形面积计算的重要起始课。探索并理解长方形面积计算公式的推导过程,积累初步推理的活动经验,感知测量单位的统一性等思想方法,对后续学习其他平面图形的面积计算有着深远的影响。一、深入过程显智慧面积是学生在学习一维长度单位之后接触的一个新事物,它和长度一样,可以度量二维图形的大小。长方形面积计算的本质在度量,所需要表达的“数”就是这个长方形里含有多少个这样的面积单位。基于学生已有的
Rectangular, square area calculation is an important starting point for students to contact polygon area calculation. Exploring and understanding the derivation process of rectangular area calculation formula, accumulating the activity experience of initial reasoning and unifying the unit of perceived measurement have far-reaching effects on the area calculation of other plane graphics in subsequent learning. First, the in-depth process was wisdom area is a unit of learning students learn a new dimension after the length of the same, it can measure the size of two-dimensional graphics. The essence of the calculation of the area of the rectangle In the measurement, the “” number that needs to be expressed is how many such units of area are contained in the rectangle. Based on what the students already have