【课前思考】“解决问题——根据实际取商的近似值”是人教版数学五年级上册第三单元小数除法例10的教学内容。例题由玻璃瓶分装香油和红丝带包装礼盒两个问题组成。由于两道题算出的结果都是小数,而需要准备的瓶子和包装的礼盒都必须是整数,因此都要取商的近似值。这样,“进一法”和“去尾法”的学习就渗透在解决分装香油和包装礼盒的问题中。基于对教材和学情的分析,有以下三点思考:1.两种取值方法,重点突破“去尾法”。学生 “Thinking before class” “Solve the problem - based on the actual approximation of the business ” is the teaching content of the tenth chapter of the PEP fifth division of the third unit decimal addition law 10. Example by the glass bottles of sesame oil and red ribbon packaging gift box two issues. Since the result of the two questions are all decimals, the bottles and packaging boxes that need to be prepared must all be integers. Therefore, we should approximate the quotient. In this way, the study of “entering a law” and “going to the end” infiltrate the problems of dispensing packaged sesame oil and packaging boxes. Based on the analysis of teaching materials and learning conditions, the following three ponders: 1. Two methods of value, the key breakthrough “to the tail method.” student