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在教学“异分母分数的加减法”一课时,需要引导学生将异分母分数先通分,转化成同分母分数(即分数单位相同的分数)再加减。有的老师认为:“一定要以两个分母的最小公倍数作公分母。”有的老师指出:“只要把异分母分数分别化成和原来相等的同分母分数,这个过程就叫作通分。公分母不一定是它们的最小公倍数。因此,不必要求学生一定要用最小公倍数作公分母来计算。”
In teaching, “Addition and subtraction of different denominator scores,” a class, you need to guide students to differentiate the denominator score first, into the same denominator (ie, the same score points) and then add and subtract. Some teachers think: “Must be the common denominator of the least common multiple of two denominators.” Some teachers pointed out: “As long as the different denominator scores are divided into the same denominator fraction equal to the original, this process is called pass The common denominators are not necessarily the least common multiple of them, so you do not have to ask the students to use the least common multiple as the common denominator. ”"