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让学生经历从实际问题中抽象出百分数的过程,理解百分数的意义;利用分数和百分数的差别,用大量生动具体的实例引发学生对百分数的进一步思考和质疑,分数和百分数的最大区别就在于百分数仅仅表示两个数量之间的倍数关系,不表示具体的数量。百分数表示一个数是另一个数的百分之几,也叫百分率或百分比。这种数学中的倍数关系是源于生活而高于生活的,从生活中提取和抽象出来的,使学生真正掌握百分数的数学价值。
Let students experience the process of abstracting percentages from practical problems and understand the meaning of percentages. Using the difference of scores and percentages, students are given a lot of vivid and specific examples to arouse students’ further thinking and questioning on percentages. The biggest difference between the scores and percentages lies in the percentage Merely means that the relationship between the two multiple, does not mean that the specific number. Percentage indicates how often a number is a percentage of another number, also called percentage or percentage. Multiples of this mathematical relationship is derived from life and above life, extracted from life and abstract, so that students really grasp the mathematical value of the percentage.