教学困惑人教版教材在三年级下册“年月日”单元中安排了一个计算经过时间的教学内容。翻阅后续的练习十三及配套的课堂作业,不难发现,这个例题承载的教学内容其实是非常丰厚的。笔者把课后练习进行归类分析后,认为计算经过时间可以分成以下四类。 Puzzled PEP teaching materials in the third grade under the book “year, month, day ” unit arranged a calculation over time teaching content. Read the follow-up exercise thirteen and supporting homework, it is not difficult to find that the teaching content carried by this example is actually very generous. After class exercises, I classify the analysis that the calculation of time can be divided into the following four categories.