在新课的开始我提出这样一个问题:“同学们,你们知道我们安徽省共有多少人口吗?先估计一下吧。”激发学生探究问题的兴趣,让学生利用生活经验认识近似数,再通过班级人数这样一个准确的数字与近似数对比,进一步增进学生对近似数的理解,认识到生活中常用近似数表示数的必要性。 At the beginning of the new class, I raised the following question: “Students, do you know how many people in Anhui have a total population? Let us estimate.” "Inspire students to explore the issue of interest so that students can understand the approximate number of life experience By comparing an exact figure of the class size with the approximate figure, the students’ understanding of the approximate number is further enhanced and the necessity of expressing the common approximate number in their lives is recognized.