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长度是人们最早形成的数学度量概念之一,与角度、质量、面积、体积等构成了不同数量的度量维度。苏教版小学数学教科书中编排了“认识线段”、“厘米和米”、“毫米和分米”、“认识千米”等章节,但教科书的编排体系中没有解释什么是长度,而是通过比较不同物体的长短感知长度,在确立一厘米和一米有多长的基础上,通过换算引出毫米和分米,在编排体系中,各单位之间的换算也就成为教师所关注的重点了。
Length is one of the earliest concepts of mathematical measurement formed, with different dimensions of measurement, such as angle, mass, area and volume. The textbook of the Supiao version of primary school mathematics arranges chapters such as “recognize line segment”, “centimeter and meter”, “millimeter and decimeter”, “know kilometer”, but there is no textbook layout system Explain what is the length, but by comparing the perception of different length of the length of the object, in establishing the length of one centimeter and one meter on the basis of the millimeter and decimeter leads to the conversion in the system, the conversion between units It has become the focus of teachers.