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我们在日常生活中,在解决实际问题时,常常只需要粗略的数据就可以达到目的。可见,估算具有重要的实用价值。同时,估算的学习对培养学生的数感具有重要意义。加强估算是当前计算教学改革的重要理念之一。数学课程标准中规定了估算的教学内容和估算意识及其技能培养的要求。其中,第一学段的具体目标是“能结合具体情境进行估算,并解释估算的过程”。第一学段的教学建议指出:“在本学段教学中,教师要不失时机地培养学生的估算意识和初步的估算技能。”
In our daily life, we often need only rough data to solve the practical problems. Visible, the estimate has important practical value. In the meantime, the estimation of learning is of great importance to cultivate the sense of number of students. Strengthening the estimation is one of the important concepts in current teaching reform. The mathematics curriculum standard sets out the estimated content of teaching and the estimation of awareness and skills training requirements. Among them, the first section of the specific goal is “can be combined with the specific situation to assess and explain the process of estimation ”. The first paragraph of the teaching recommendations pointed out: “In this session of teaching, teachers should seize the opportunity to develop students’ awareness of estimation and preliminary estimation skills. ”