一、分数的意义。把一个物体平均分成若干份,表示这样的一份或几份的数叫作分数。在这里,“一个物体”可以是一条绳子、一块饼、一张纸……随着今后的学习,还可以是一筐苹果、一个班级、一群鸭子……“平均分”是分数成立的前提条件,没有“平均分”也就不可能有分数的存在,也就是说分数一定要建立在“平均分”的基础上。像图1、图2可以分别用分数1/2、4/6表示,图3就不能用分数2/3来表示。二、分数的名称。一个分数由分母、分数线、分子三部分组成,分数中间的横线叫分数线,分数线下面的数叫分母,分数线上面的数叫分子。分母表示 First, the meaning of the score. Dividing an object into equally divided parts means that the number of one or more such pieces is called a score. Here, “an object ” can be a rope, a piece of cake, a piece of paper ... With the future study can also be a basket of apples, a class, a group of ducks ...... “Average Score ” is the score The prerequisite for the establishment, there is no “average ” there will be no score, which means that the score must be based on the “average”. Like Figure 1, Figure 2 can be fractional 1/2, 4/6 said, Figure 3 can not be used to score 2/3 to represent. Second, the name of the score. A score by the denominator, fractional line, the molecular composition of three parts, the middle of the horizontal line called the score line, the number below the score line called the denominator, the score above the number of molecules called. Denominator said