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近日,笔者教学人教版四年级数学下册第93页《练习二十二》第2题时遇到了困惑,题目如下:2.下面是肖扬同学周一至周五上学所花时间的情况.(1)她平均每天上学要花多少时间?(2)第一节课上课时间是上午8:00,肖扬什么时间从家里出发合适?学生在独立审题后解答,答案出乎意料的一致,都认为7:42(即提前18分钟)合适,更有甚者认为7:40(即提前20分钟)出发合适,给出的理由也都相同,都认为按前面周一到周五提供的数据来看,提前18分
Recently, the author taught PEP 4 grade mathematics volumes on page 93, “Practice 22” Question 2 encountered confusion, the title is as follows: 2. The following is Xiao Yang students Monday to Friday to go to school took time. 1) How much time does she spend on average per day? (2) The first class time is 8:00 am, when does Xiao Yang start from home? Students answer the question independently after the examination, and the answer is unexpectedly unanimously agreed 7:42 (that is, 18 minutes earlier) is appropriate, What is more, that 7:40 (that is, 20 minutes in advance) suitable starting, given the same reasons, all think that according to the previous data provided Monday to Friday, 18 minutes in advance