课前思考:“有多重(认识千克、克)”是北师大版小学数学三年级下册第四单元第一小节的内容,它是学生初步认识质量单位“千克和克”的教学。“克和千克”虽然都是我们日常生活中用到的常见的质量单位,但学生平时接触它们的机会也不多,它们比长度单位更抽象,看不到摸不着,基于这种情形,在本节课中,我决定从学生已有的生活经验出发,给学生创设了一个“生活化”的课堂,从课前调查入手,以操作活 Thinking before class: “There are multiple (knowledge of kilograms, grams)” is the first section of the fourth unit of the third grade undergraduates of Grade Three in Primary School of Beijing Normal University. It is a preliminary understanding of the quality unit “kg and gram” Teaching. Although both are common quality units used in our daily life, students have little chance of getting in touch with them at ordinary times. They are more abstract than length units and can not be touched. Based on this situation In this lesson, I decided to set out from the student’s existing life experience and create a “living” classroom for the students. Starting from the pre-class investigation,