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分数的基本性质,是进行分数四则计算所必需具备的基础知识,它的本质是分数的意义的特定情况的反映,与商不变的性质是一致的。所以可利用知识的迁移功能完成教学任务,由学生的旧知同化新知。 为了让学生对分数的基本性质理解得具体形象,我先出示一玻璃量筒,(一侧用蓝色划出三等分的等分线,对面一侧划六等分的等分线,内装1/3的淡红色的水)让学生先观察三等分的一侧。提问:“老师把量筒的总容量平均分成了几份?水占有总容量的几分之几?”(1/3)再把量筒旋转180°,让学生观察:“现在把总量平均分成了几分?水占了几份?所以水
The basic nature of the score is the basic knowledge necessary to make the four-point calculation. Its essence is the reflection of the specific circumstances of the meaning of the score, which is consistent with the invariable nature of the quotient. Therefore, the function of knowledge transfer can be used to complete the task of teaching, assimilation of new knowledge by the students' old knowledge. In order to make students understand the basic nature of the score specific image, I first show a measuring cylinder, (one side of the blue division of the trisection of the bisector, the opposite side of the division of a half-equal bisector, built-in 1 / 3 reddish water) to allow students to observe the trisection of the side. Question: “The teacher divided the total capacity of the graduated cylinders into several equal parts? What fraction of the total capacity of the water?” (1/3) Then the graduated cylinder was rotated 180 ° to allow students to observe: "Now divide the total into How many water? So water