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一、知识出现断层人教版数学四年级上册第四单元第53页例5(2)不太妥当。此题先要求出10分钟行的路程,225×10=2250(米),然后再进行单位换算,即2250米=2.250千米。我认为安排此题的目的是为了让学生从日常生活的事例中掌握“速度×时间=路程”这个基本的数量关系式,并非为了“单位换算”。退一步说,即便编者考虑到需要复习以前的知识,在此处设计改写成三
First, the knowledge of the fault PEP fourth grade fourth volume on page 53 Example 5 (2) is not appropriate. This question requires a 10-minute trip, 225 × 10 = 2250 (meters), and then the unit conversion, that is 2250 meters = 2.250 kilometers. I think the purpose of this question is to allow students to grasp the basic quantitative relationship of “speed × time = distance” from the examples of daily life, not for “unit conversion”. Step back and say that even if the editor takes into account the need to review the previous knowledge, where the design rewritten into three