论文部分内容阅读
【课前思考】百分数是在学生学过整数、小数、特别是分数概念和用分数解决实际问题的基础上进行教学的。百分数实际上是表示两个数相比的一种关系,因此,它与分数有密切的联系。对百分数意义的深刻理解,是教学的重点;弄明白百分数与分数在意义上的区别,是教学的难点。【课堂实践】一、创设情境,引出百分数的概念1.判断谁的优秀率最高。师:前不久咱们学校举行了运动会。在跳绳这一项目中,一年级有170人成绩优秀,三年级有162人成绩优秀,五年级有190人成绩优秀。你认为哪个年级的优秀率最高?
[Thinking before class] Percentages are taught on the basis of students’ learning of integers, decimals, especially the concept of fractions, and the use of fractions to solve practical problems. Percentage is actually a relationship between two numbers, so it is closely related to the score. A deep understanding of the meaning of the percentage is the focus of teaching; to understand the difference between the percentage and the score in the sense that it is difficult for teaching. [Class Practice] First, create the situation, the concept of a percentage 1. To determine who the highest rate of excellence. Teacher: Not long ago our school held a sports meeting. In the skipping project, 170 students achieved excellent grades in the first grade, 162 outstanding in the third grade and 190 outstanding students in the fifth grade. Which grade do you think the highest rate of excellence?