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估算教学是数学课程改革的“新鲜血液”之一,2011版《数学课程标准》中更加明确的提出了培养学生“能结合具体情境,选择适当的单位进行简单的估算,体会估算在生活中的作用”“在解决问题的过程中,能选择合适的方法进行估算”。尽管估算教学被认为是计算教学的重要组成部分,是学生数学素养的要素之一,但是,十多年课改以来,估算教学依然是不少教师反映的教学难点。究其原因,笔者以为是部分教师对估算教学存在着一些
Estimation teaching is one of the “new blood” of the mathematics curriculum reform. The 2011 edition of “Mathematics Curriculum Standards” more clearly put forward to train students “can combine the specific situation, select the appropriate units for simple estimation, experience estimated at The role of life ”“ in the process of solving the problem, can choose the appropriate method of estimation ”. Although estimation teaching is considered to be an important part of calculation teaching and one of the elements of students’ mathematical literacy, estimation teaching is still a difficult teaching point reflected by many teachers since more than 10 years of curriculum reform. The reason, I think it is part of the teacher there are some estimates of teaching