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《中小学数学》(小学版)2013年1-2期期刊登了《教学长度单位可介绍“百米和十米”》(以下简称《教文》)一文,其中提到部分教师对长度单位的认识模糊。笔者在与小学数学教师交流中也发现了一些教师在计量单位认识上的不足,比如,“1公顷的面积有多大?与1平方千米的进率是多少?”能正确回答者寥寥无几。众所周知,对基本量的计量在日常生活和生产中普遍存在,是公民的常识,因而也是小学数学的基础知识,而其中对计量单位的认识更是学习计量的基础。鉴于小学生的学习需求和学习能力,小学课本只涉及了“常见”单位的认识。但对于教师而言,显然不
“Primary and secondary mathematics” (Primary Edition) 2013 1-2 period published “teaching length unit can be introduced” one hundred meters and ten meters “” (hereinafter referred to as “teaching”), which mentioned some teachers on the length Unit awareness blurred. The author also found some teachers in the exchange of elementary mathematics teachers in the lack of knowledge of units of measurement, for example, “1 hectare area is how much? With 1 square kilometers of the rate is?” “The correct answer to a handful Not much. It is well-known that the measurement of basic quantity is ubiquitous in daily life and production, and is the common sense of citizens. It is also the basic knowledge of elementary mathematics, and the understanding of the unit of measurement is the basis of learning measurement. In the light of pupils’ learning needs and learning abilities, primary school textbooks only deal with the knowledge of ”common " units. But for teachers, obviously not