【案例】一次,听一位教师上“分数的基本性质”,感受颇深。首先,她让学生把32厘米长的纸条任意对折(即平均分成若干份),用彩色笔描出折痕,然后从一端开始,取其一半的份数画上阴影,并用分数表示出阴影部分占整个份数的多少。在此基础上让学生思考:谁写出的分数大?并在四人小组内 [Case] ​​Once, listening to a teacher on the “basic nature of scores,” deep feelings. First, she asked the student to fold the 32 cm long piece of paper either evenly (that is, evenly divided into several pieces), with a colored pencil to draw a crease, and then from one end, the half of the portion was shaded and the shaded portion The total number of copies. On this basis, let the students think: Who wrote the score? And in the four-person group