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近年来,“估算”越来越受到人们的重视,大力培养学生估算意识与能力已成为老师们的共识。这是由于它在生活中的实用性、应用的广泛性,更重要的是估算作为一种重要的数学思想方法和数学能力,可以提高学生对计算或测量结果的概括性、整体性的认识和理解,对数量关系和空间形式进行合理的判断与推理,提高学生处理和解决实际问题的能力,发展学生思维的开放度。在教学中大力培养估算意识和能力是提高学生数学能力的重要方面,而在估算教学中重视“开放”便成为教学成功与否的重要标志。
In recent years, “Estimation” has drawn more and more attention from people. It has become the consensus of teachers to cultivate students’ awareness and ability. This is due to its practicality in life, the wide range of applications, and more importantly, the estimation as an important mathematical method and mathematical ability to improve students’ generality and understanding of the calculation or measurement results. Understand, make reasonable judgments and inferences about quantitative relationships and spatial forms, improve students’ ability to handle and solve practical problems, and develop the openness of student thinking. It is an important aspect to improve students’ mathematical abilities to cultivate the evaluation consciousness and ability in teaching. However, the importance of “openness” in the evaluation teaching becomes an important symbol of the success of teaching.