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小学数学中几何图形面积计算是教学的重点、难点。由于小学生的抽象思维和空间想象能力较弱,我在教学中充分发挥投影的直观性和形象性的优势,进行基本图形、变换图形、组合图形的训练,真是妙趣横生,增强了教学效果,培养了学生观察比较、分析和归纳能力。一、展示简单图形,认识基本公式。我在基本图形教学过程中,利用投影的直观性,对长方形、平行四边形、三角形、圆形等图形的面积计算公式的推导过程进行演示。让学生切实掌握这些公式的来龙去脉。如在演示三角形面积和长方形面积有什么关系时,学生从两个完全一样的三角形可拼成一个长方形,这个长方形的长和宽与三角形的底和高分别相等,明白了
Calculation of geometry area in elementary mathematics is the key point of teaching. Due to the poor ability of primary school students’ thinking and spatial imagination, I gave full play to the intuitiveness and vividness of projection in teaching. It is really fun to train basic graphics, transformation graphics and combination graphics so as to enhance teaching effectiveness and cultivate Students observe and compare, analyze and summarize their abilities. First, show simple graphics, understanding of basic formulas. In the process of teaching basic graphics, I used the intuition of projection to demonstrate the derivation of area calculation formulas of rectangles, parallelograms, triangles and circles. Allow students to effectively grasp the ins and outs of these formulas. As in demonstrating the relationship between the area of the triangle and the area of the rectangle, students can form a rectangle from two identical triangles. The length and width of the rectangle are equal to the height and the height of the triangle respectively.