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一、课前的准备:我在讲授公制和市制度量衡之前,首先分发给每一个学生如下的一张“度量衡单位表”。由于每个学生在小学里已经初步学习过公制和市制度量衡,对于它们的各个单位名称和相邻两单位之间的进率都是熟习的,而且对于公制和市制之间的简单互换关系也是大体清楚的,因而事前填好这张“度量衡单位表”也就不会有什么特殊困难。通过课前的填写,学生普遍地都得到了一次复习公制和市制度量衡的机会,为学习这一内容时奠定了良好的基础。
First, pre-class preparation: Before I taught the metric system and the city system, I first distributed to each student the following “measurement and weighting unit table”. Since each student has initially studied the metric system and the municipal system in primary school, he is familiar with the name of each unit and the rate of advance between two neighboring units, and is a simple exchange between the metric system and the municipal system. The relationship is also generally clear, so there will be no special difficulties in filling out this “metrical unit table” beforehand. By filling in the class, students are generally given an opportunity to review the metric system and the city’s system. This has laid a good foundation for learning this content.