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估算作为一种重要的数学能力,近年来逐渐受到国内外数学教育界的重视。《新数学课程标准》中对估算教学也提出了明确的目标和要求:“在小学第一学段要求学生能结合具体情境进行估算,并解释估算的过程;第二学段要求学生在解决具体问题的过程中,能选择合适的估算方法,养成估算的习惯。”在新教材中估算教学纵向贯穿于各个年级,横向蕴含于数与代数、空间与图形、统计与概率、实践与综合应用等内容的具体教学中。可结合平时的教学实践,及与同事交流学
As an important mathematical ability, estimation has been paid more and more attention by maths education circles at home and abroad in recent years. The New Mathematics Curriculum Standard also sets clear goals and requirements for the evaluation of teaching: “In the first phase of primary school, students are asked to combine specific situations to explain and explain the process of estimation. In the second phase, students are required to solve Specific problems in the process, we can choose the appropriate estimation method to develop the habit of estimation. ”Estimation in the new textbook teaching longitudinal through all grades, the horizontal contains in numbers and algebra, space and graphics, statistics and probability, practice and Comprehensive application of content such as specific teaching. Can be combined with the usual teaching practice, and exchange ideas with colleagues