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分数乘除法应用题是小学数学第九册的重要内容之一,也是教学的一个难点。如何教好这部分内容,做法不一,观点各异。从目前情况看,由个别字词找单位“1”,以单位“1”是否已知定算法,按量率对应列算式的教法仍为部分教师所采用。而且,标准量×分率=比较量等解题公式,对应量、对应分率等术语,使分数应用题越讲越抽象。学生记得住,套得上,却不解其意。解题成了按图索骥,记忆替代了思维,刻板压抑了灵活。
The fractional multiplication and division application is one of the important contents of the ninth grade of elementary mathematics. It is also a difficult point of teaching. How to teach this part of the content, different approaches, different views. From the current situation, the individual units to find the word “1” to the unit “1” whether the known algorithm, according to the rate of the corresponding formula is still used by some teachers. Moreover, the standard amount of × fraction = comparison of the problem-solving formula, the corresponding amount, the corresponding rate and other terms, so that the fraction of the more abstract application questions. Students remember to live on, but do not understand their meaning. Solved the problem into what to do, memory replacement of thinking, rigid suppression of flexibility.