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一、案例描述六年级学生经常会遇到这样的选择题:“有一根绳子,第一次用去13,第二次用去13米。哪次用得多?”其选项一般为“第一次多、第二次多、两次一样多、无法比较”。(后文简称“问题1”)通常,在让学生分类讨论(如绳子长度为0.6米、1米、3米)后,多数学生也能够理解。然而,当问题发生变式之后,如变成“有一根绳子,第一次用去23,第二次用去23米。哪次用得多?”(后文简称“问题2”)有
First, the case description Sixth grade students often encounter such a multiple choice: “There is a rope, the first time to go to 13, the second to go 13 meters. Which use more? ” The options are generally “The first time, the second time, twice as many, can not be compared.” (Hereinafter referred to as “Question 1 ”) Most students are usually able to understand after having students classify their discussions (such as rope length of 0.6 m, 1 m, 3 m). However, when the problem has changed, such as into a “rope”, the first time to go to 23, the second to go 23 meters. Which use much? “(Hereinafter referred to as” Question 2 ")Have