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教学内容:五年制小学《数学》第五册第119页。目的要求:1.使学生理解求平均数应用题的结构及数量关系,能正确解答这类应用题。2.在教学中渗透“集合”等现代数学思想,培养学生的思维能力。教学过程: 一、通过“移多补少”的实际操作,建立平均数的概念。 1.揭示课题,引起悬念。教师:今天我们开始学习求平均数应用题。什么叫“平均数”?怎样求出平均数?这种问题在你们日常生活学习中经常遇到,希望大家好好学习。 2.实际操作,引出概念。教师把事先准备好的三个玻璃杯放在讲台上,并在三个杯里分别放进2支、3支、7支彩色铅笔,边放边让学生默默数数。放好后,引导学生观察并
Content: Five-year primary school “Mathematics” fifth volumes 119 pages. Objectives Requirements: 1. To enable students to understand the average number of questions and the relationship between the structure of the number of questions, can correctly answer such applications. 2. In teaching to penetrate the “collection” and other modern mathematical ideas, develop students' thinking ability. Teaching process: First, through the “move to make up less” actual operation, the establishment of the concept of the average. 1. Reveal the subject, causing suspense. Teacher: Today we are starting to learn how to apply for averages. What is the “average”? How to find the average? This problem is often encountered in your daily life study, I hope you study hard. 2. The actual operation leads to the concept. The teacher placed three glass cups prepared in advance on the podium, and placed two, three and seven color pencils in three cups, respectively, to let the students silently count. Put away, guide students to observe and