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理解单位“1”的含义是理解分数的意义和解答分数应用题的关键和前提。怎样帮助学生理解单位“1”呢? 第一,通过举例、图示,使学生了解单位“1”是可以分的事物。它可以表示一个物体,一个计量单位,也可以表示由一些物体组成的整体。如一块田、一条公路、一堆苹果、一项工程等。它比整数里的l的含义更广泛、更抽象了。第二,通过举例、图示,使学生明确用分数表示的部分与单位“1”的关系。如把4个苹果看做单位“1”,一个苹果就是单位“1”的1/4,把6面红旗看做单位“1”,它的1/3就是2面红旗。第三,通过举例使学生正确确定单位“1”。确定单位“1”,要看谁与谁比,要把被比的数量看作单位“1”。例如,桃树棵树是梨树的3/4,桃树棵树与梨树
Understanding the meaning of the unit “1” is the key and prerequisite for understanding the meaning of the score and answering the question score application. How to help students to understand the unit “1”? First, through examples, illustrations, so that students understand the unit “1” is something that can be divided. It can represent an object, a unit of measure, or it can represent an entire body of objects. Such as a field, a road, a pile of apples, a project. It is more general and abstract than l in integers. Second, by way of example, illustration, to enable students to express clearly the part of the relationship with the unit “1”. If the four apples as the unit “1”, an apple is the unit “1” 1/4, the 6 red flags as the unit “1”, 1/3 of it is 2 red flags. Third, by way of example, students can correctly determine the unit “1”. Determine the unit “1”, to see who is compared with whom, to be compared to the number of units as a “1”. For example, peach trees are 3/4 of pear trees, peach trees and pear trees