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小学数学第九册介绍有关百分数的知识时,有四处运用了“通常”二字。教学时,教者首先必须正确理解“通常”的深刻含义,然后才能采取灵活的教学方法。现对四个“通常”的含义及用法分述如下: (一)“通常是用百分数进行比较的”。教材中一开始就指出:“在生产、工作和生活中,进行调查统计、分析比较时,经常要用到百分数。”这是“由于百分数分母相同(都是100),便于比较”,从而揭示了学习百分数的重要意义。正因为百分数应用广泛,便于比较,故“通常”用百分数进行比较。这就说明
The ninth volume of primary school mathematics introduces the knowledge of the percentage, there are around the use of “usually” word. Teaching, the teacher must first correctly understand the “usual” profound meaning, and then to adopt a flexible teaching methods. The meanings and usages of the four “usual” points are as follows: (a) “Usually, the percentage is compared.” The textbook states from the outset: “In surveying, comparing, and analyzing, we often use percentages in production, work and life.” This is “the comparison of percentages with the same denominator (all 100) for comparison” The importance of learning percentage. Because of the wide range of applications, easy to compare, it is “usually” compared with the percentage. This incidates that