教学目的:使学生初步建立单位“1”的概念,理解分数的意义及其分子、分母、分数单位的含义。教学重点:理解分数的意义。教学难点:初步建立单位“1”的概念。课前准备:一个圆,一个长方形,一条线段,20根小棒。教学过程: 1.复习旧知,创设情境,突出分数的前提——“平均分”。上课时,教师提出:“把一张饼,分给3个小朋友,如果分的大小一样,每个小朋友得到这张饼的多少?”要求学生列出算式。教师小结:象这样两个自然数相除,商不能得到整数,这就需要产生一个新的数——分数。什么叫分数呢?这节课我们就来研究分数的意义(板书 Teaching Objective: To enable students to initially establish the concept of unit “1” and understand the meaning of the score and its meaning of numerator, denominator and fractional unit. Teaching Point: Understand the meaning of points. Difficulties in teaching: the initial establishment of the unit “1” concept. Pre-class preparation: a circle, a rectangle, a line, 20 small sticks. Teaching process: 1. Review the old knowledge, create situations, highlight the premise of the score - “average points.” In class, the teacher proposed: “Give a cake to three children, and if the size of the division is the same, how many children each get the cake?” Ask students to formulate formulas. Teacher's Summary: Dividing the two natural numbers like this, the quotient can not get the integer, this needs to produce a new number - fraction. What is the score? This lesson we will study the meaning of the score (blackboard