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我们在教学生认识分数时,特别提出了“单位1”这一概念。但什么是单位1?单位1与自然数1有什么区别与联系?不但课本中没有明确指出,就是教学参考书和其它材料中也没有一个清晰明确的答案。大家只能根据分数的意义理解为:把一些物体看作一个整体的1是单位1,而整体中的每一个物体的1就是自然数1:或者说:用于等分时的1是单位1,用于数数时的1是自然数1。例如:把5个苹果看作为一个整体时,这5个苹果作为一个整体的“1”是单位1,而5个苹果中的一个苹果的“1”是自然数1。把一个西瓜平均分成4份,这时的一个西瓜的“1”是单位1,而在数有几个西瓜时的“1”是自然数1,如此等等。可是这样的解释,还是没有让人明确出看出:单
In teaching students to recognize scores, we put forward the concept of “unit 1 ”. But what is Unit 1? What is the difference and connection between Unit 1 and Natural Number 1? Not only is it not clearly stated in the textbook that there is no clear and definite answer in teaching reference books and other materials. We can only be understood according to the meaning of the score as: a number of objects as a whole is a unit of 1, and the whole of each object 1 is a natural number 1: Or: for the equinox 1 is the unit 1, 1 for natural numbers is a natural number. For example, when you consider five apples as a whole, the “1” of the five apples as a whole is in unit 1, and the “1” of one of the five apples is a natural number one. Divide one watermelon equally into 4 parts. At this time a watermelon’s “1” is in unit 1, and “1 ” in the case of several watermelons is a natural number of 1, and so on. However, this explanation, or did not make it clear that: single