计量单位在日常生活中应用非常普遍,学生在学习之前已有一定的生活经验,但却常出现一些让人啼笑皆非的例子,学生对一些本应容易对应的大计量单位张冠李戴,如1头猪重3(吨),篮球场面积大约为300(公顷)……缘由何在呢?下面就以教研课“认识公顷”为例,阐述观点。一、分析认知现状,找准研究落脚点“认识公顷”是学习了面积单位平方厘米、平方分米、平方米后教学的,但是有别于前者,它大的让学生无法用感官直接触摸感知。研究教材,初步发现本课 Unit of measurement in everyday life is very common, students have some experience in life before learning, but often there are some ironic examples of students should some easily correspond to the large units, such as a pig weight 3 (t), the basketball court area is about 300 (hectare) ...... What is the reason? Here is the teaching and research section “Know the hectare ” as an example, expounding the point of view. First, the analysis of the status quo of cognition, identify the foothold of the study “Know the hectare ” is to learn the area of ​​square centimeter, square decimeter, square meters after teaching, but different from the former, it is so large that students can not use the senses Direct touch perception. Study materials, initially found this lesson