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面积的计算是“图形与几何”领域的重要内容。这是学生首次学习图形面积计算公式。这一内容,既是在探索长方形和正方形面积计算公式中进一步理解面积和面积单位的意义,又为今后学习平行四边形、三角形、梯形和圆面积公式做必要的铺垫,同时,也是培养学生空间观念的重要时机,因此十分关键。李静、武传刚老师的教学设计(以下简称“李老师等的设计”)和郭东根、黄丽萍老师的教学设计(以下简称“郭老师等的设计”),过程虽有一定的差异,但是都很好地体现了教学目标,取得了殊途同归的良好效果。
The area calculation is an important part of the “graphics and geometry” field. This is the first time students learn to calculate the area of a graph. This content not only deepens the understanding of area and unit of area in exploring rectangular and square area formula, but also paves the way for learning parallelogram, triangle, trapezoid and circle area formula in the future. At the same time, it also cultivates students’ space concept Important moment, so it is crucial. Li Jing, Wu Zhigang’s teaching design (hereinafter referred to as “Li’s design”) and Guo Donggen, Huang Liping’s teaching design (hereinafter referred to as “Guo” design), although the process is somewhat different, However, all of them reflected the teaching goal very well and achieved the good effect of reuniting with different paths.