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一、问题的缘起在学习完苏教版小学数学三年级下册“年、月、日”单元时,有这样一道题目:“小明从7月8日开始学习游泳,到月底一共学习了多少天?”全班同学大致呈现了以下两种算法:(1)31-8=23(天)(2)31-8+1=24(天),第一种算法的同学认为,求“经过的天数”就可以用“后一天”去减“前一天”;第二种算法的同学进行了反驳,认为“两头”(指“8日”和“31日”)都要算,所以要加1。在后来的争论中,全班同学达成了共
First, the origins of the problem Su Yuejiao primary school mathematics in the third grade after learning the next volume, “year, month, day” unit, there is such a problem: “Xiao Ming from July 8 to learn to swim until the end of a total learning How many days? ”Classmates generally presented the following two algorithms: (1) 31-8 = 23 (days) (2) 31-8 +1 = 24 (days), the first algorithm students think, Seeking “the number of days after” can be used “day after the day ” to reduce “the day before ”; the second algorithm classmates were refuted, that “” And “31 ”) have to count, so to add one. In the ensuing debate, the class reached a total of students