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【片断一】新授渗透,加深理解特级教师王凌《认识分数》精彩片断师:这些数都是分数,想知道分数是怎样产生的吗?(教师介绍分数的发展史,课件演示)片断1:在古代,人们分东西(果实、猎物)时经常出现结果不是整数的情况,于是,渐渐产生了分数。我们刚才是将什么平均分不能得到整数的结果?(蛋糕)片断2:在我国,很早就有了分数,最初用算筹表示。例如,把一个物体平均分成4份,每1份就表示成。下面的4
[Piece] a new grant infiltration, to deepen the understanding of super-class teacher Wang Ling “recognition score” wonderful piece division: These are the scores, want to know how the score is generated? (Teachers introduce the history of scores, courseware demo) : In ancient times, when people divided things (fruits, prey), it often happened that the result was not an integer. As a result, scores gradually came into being. What is the result of what we just did not get an average? (Piece of Cake) Piece 2: In our country, we got a score very early, initially expressed in the calculation. For example, divide an object into four equal parts, each expressed as 1. Below 4