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分数是整数概念的扩展,但它比整数概念抽象,因此分数概念较难建立。为突破这一难点,教材根据学生认识规律,把分数分两阶段安排教学。八册的“分数意义”,就是在第一阶段教学的基础上,进行第二阶段教学的开始。目的是使学生明确分数的意义。理解“单位1”的概念,并掌握分数与除法的关系。围绕这一数学目的,我们可设计以下四种练习。一、理解单位“1”的练习 1.下列各图中的阴影部分和空白部分各占整个图
Fraction is an extension of the concept of integers, but abstract than the concept of integers, so the concept of scores is more difficult to establish. To break through this difficulty, textbooks based on the rules of understanding students, the scores in two stages arranged for teaching. The “fractional significance” of the eight volumes is the beginning of the second phase of teaching on the basis of the first phase of teaching. The purpose is to make students clear the meaning of the score. Understand the concept of “Unit 1” and grasp the relationship between fraction and division. Around this mathematical purpose, we can design the following four exercises. First, understand the unit “1” exercise 1. The following figures in the shaded part and the blank part of the entire figure