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片段一:师:同学们请认真观察,猜一猜1/4和3/4这两个分数谁大。师:如果用一个圆来代表一个月饼。(拿起学生桌面的两个圆。)请你在这两个圆中一个表示出1/4,一个表示出3/4,然后再比较它们的大小。开始行动吧。师:都做好了吗?举起这两个圆给老师看看。师:很好。放到桌面,比一比1/4和3/4谁大。师:谁愿意来说说你是怎么比的?生1:我是这样比的:这里的一份小于这里的3份,所以四分之一小于四分之三。(学生边说边在图上比画。)生2:涂1份就是1个四分之一,涂3份就是3个四分之一,所以四分之三大。
Fragment one: Teacher: Students please carefully observe, guess a quarter and 3/4 who scores two big. Teacher: If you use a circle to represent a moon cake. (Pick up two circles on the student’s desktop.) Ask you to indicate 1/4 in one of the two circles, one for 3/4 and then compare their size. Let’s move on. Teacher: Are you ready? Lifted these two rounds to the teacher to see. Teacher: very good. Put on the desktop, who is bigger than a quarter and 3/4. Teacher: Who is willing to say how you compare? Health 1: I am the ratio: here is less than 3 copies, so a quarter less than three-quarters. Students say while drawing on the graph.) Student 2: Apply 1 is 1 quarter, apply 3 is 3 quarters, so three-quarters of the big.