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“比和比例”是小学数学的一项重要内容,也是教学中的一个难点。去年我教过这一部份内容,取得了较好的教学效果,下面谈几点体会。一、抓住比的本质特征,全面阐述比的意义。比的实质就是两个数相除。教学时要抓住“两个数相除又叫做两个数的比”的本质特征,由两个同类量的比,推广到两个不同类量的比来闸明比的意义。同时还要注意讲清以下几个问题:(1)两个同类量相比时,单位必须相同,单位不同的不能直接写成比(如3公里
“Ratio and proportion” is an important part of elementary mathematics, teaching is also a difficult point. Last year I taught this part of the content and achieved good teaching results. First, grasp the essential characteristics of the ratio, a comprehensive exposition of the significance of ratio. The essence of ratio is divided by two numbers. In teaching, we should grasp the essential characteristics of “the ratio of two numbers divided by two numbers,” which is extended from the ratio of two similar types to the meanings of two different types of ratios. At the same time also pay attention to clarify the following questions: (1) two similar units compared to the same units, different units can not be directly written (such as 3 km