《中小学数学》(初中版)2009年第4期《对近似数的思考》一文中,作者对“约五百人”与“约500人”作了三种思考,在第10期上,林华荣老师也对此发表了自己的见解,两位老师对教材的理解和分析都很深入,很值得我们一线教师学习.实际上教书就是一个在探讨实践中教学相长的过程.下面是我对这几个问题的一点粗浅认识,仅供大家参考.生活中的数字,或大,或小,有些能得到准确值,有些就不能或者不需要,为了达到一定的表达效果,就需要适当的表达形式.无论是准确数还是近似数,就数字本身而言,大体上有三种可选择的形式:①小数形式, In his article “Thinking about Approximations” in “Elementary and Middle School Mathematics” (Junior High School Edition) 2009, No. 4, the author made three kinds of thinking on “about 500 people” and “about 500 people” 10, Lin Huarong teachers also expressed their views on this, the two teachers on the teaching of understanding and analysis are very in-depth, it is worth our frontline teachers to learn .In fact, teaching is a process of discussion in the practice of teaching and learning. I am a little superficial understanding of these issues for your reference only. The number of life, large or small, some can get the exact value, some can not or not, in order to achieve a certain expression, you need to be appropriate Whether accurate or approximate, in terms of the number itself, there are basically three alternative forms: ① decimal form,