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“估算”是新课程中新增的内容,是有别于传统教学内容的一大亮点.的确,估算具有重要的实用价值,人们在日常生活中,常常只需要估算结果,同时,估算的学习对培养学生的数感具有重要的意义.《数学课程标准》明确提出要加强估算,并对各学段的估算提出了具体的要求:第一学段要“能结合具体的情境进行估算,并解释估算的过程”;第二学段要“在解决具体问题的过程中,能选择合适的估算方法,养成估
”Estimation “ is the new content in the new curriculum, which is different from the traditional teaching content of a major bright spot. Indeed, the estimation of the important practical value, people in daily life, often only need to estimate the results, while estimating Is of great significance to cultivate the sense of number of students.Mathematics Curriculum Standards clearly put forward to strengthen the estimation and put forward specific requirements for the estimation of each semester: the first semester should be able to be carried out according to the specific situation Estimate, and explain the process of estimation ”, the second paragraph to " In the process of solving specific problems, can choose the appropriate estimation method, develop a valuation