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变式教学,即用不同形式的直观材料或事例,通过交换同类事物的非本质特征,来抽出或说明事物本质属性的教学方法。在小学数学几何初步知识教学中,变式教学运用非常广泛,主要有以下几种形式。一、变式题组变式题组是把相关的交武材料,按照一定的逻辑顺序,由浅入深,由易到难地设计组织成一组层次分明的变式题组供学生练习。例如,在教学平行四边形的面积计算公式后,为了让学生正确地把握平行四边形面积计算的本质属性,弄清楚平行四边形的面积与底和高的关系,教师可设计这样一组变式题组。 1.下面哪些平行四边形的面积是4×3=12(平方厘米)?(单位:厘米。以下同。)
Variant teaching, that is, with different forms of intuitive materials or examples, by exchanging non-essential features of similar things, to extract or illustrate the teaching of the nature of things. In elementary mathematics geometry initial teaching, variant teaching is widely used, mainly in the following forms. Variant problem group Variant problem group is related to the materials to be submitted, according to a certain logical order, from light to dark, easy to difficult to design organized into a set of structured variant group for students to practice. For example, after teaching the formula of parallelogram area, the teacher can design such a set of variant questions so that students can correctly grasp the essential properties of parallelogram area calculation and understand the relationship between area and height of parallelogram. 1. Which of the following parallelogram area is 4 × 3 = 12 (square centimeters)? (Unit: cm. The same below.)