新课程改革非常重视对学生估算意识和估算能力的培养,《数学课程标准(2011年版)》对每一个学段都明确提出了要求,第一学段:“能结合具体情境,选择适当的单位进行简单估算,体会估算在生活中的作用。”第二学段:“在解决问题的过程中,能选择合适的方法进行估算。”人们的日常生活处处与估算有着紧密的联系,如:家里几个人,一餐大约要煮多少米;一天买几种菜,大约要带多少钱;学生从家到学校大约需要多长时间;买房大约需要多少钱,每个月攒多少,大约要攒几年。这些大事小事都不要求算出准确 The new curriculum reform attaches great importance to the cultivation of students’ estimation and estimation ability. The Standard of Mathematical Curriculum (2011 Edition) explicitly sets forth the requirements for each of the first semesters. The first paragraph: “Combining with specific situations, Unit to make a simple estimation, to understand the role of estimation in life. ”Second semester:“ In the process of solving the problem, we can choose the appropriate method to estimate. ”People’s daily lives are closely linked with the estimation , Such as: a few people at home, a meal about how many meters to cook; one day to buy several dishes, about how much money to bring; students from home to school about how long it takes; buy a house about how much money, save each month, Save about a few years. These events do not require accurate calculation