“小数的产生和意义”是人教版四年级下册《数学》教材第四单元第一课时的内容。它是在学习了“分数的初步认识”和“小数的初步认识”的基础上进行教学的,是学生系统学习小数的开始。本节课要达成的目标是:让学生知道分数与小数的联系,明确小数的计数单位,认识小数并理解小数的意义。学生对小数意义的理解涉及十进分数,由于学生没有系统学习分数的知识,理解分数的十进关系有困难,因此在教学这一内容时选用了米尺作直观教具,旨在借助长度单位关系,让学生明 “The production and meaning of decimal ” is the content of the first lesson of the fourth unit of the fourth grade of the PEP teaching book “Mathematics”. It is based on the learning of “initial recognition of scores” and “initial recognition of decimals”, which is the beginning of a decimal system for students to learn. This lesson is to achieve the goal of: letting students know the relationship between the fraction and the decimal, clarifying the counting unit of the decimal, recognizing the decimal, and understanding the meaning of the decimal. Students’ understanding of the meaning of decimals involves decile scores. Since students do not have systematic knowledge of scores and have difficulty in understanding the decadal relationship of scores, they chose to use the metric ruler as a visual aid in the teaching content, aiming at using length units , Let the students know