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分数知识的学习历来是小学数学的难点,而异分母分数加减法又是小学加减法运算的最高阶段,它与整数、小数加减法运算有相同点,都是只有计数单位相同时才能相加减;但整数、小数的计数单位具有直观、显性化的特点,而异分母分数在进行加减法运算时,会产生新的分数单位,这个分数单位相对抽象并隐蔽。如何让学生理解异分母分数加减法算理的本质,切实掌握计算方法呢?
The study of fractional knowledge has always been the difficulty of primary school mathematics, while the addition and subtraction of different denominator is the highest stage of primary school addition and subtraction operations, which is the same as integer, decimal addition and subtraction operations are only the same when the counting units However, the unit of counting of integers and decimals has the characteristics of intuition and dominance. When the different denominator scores are added or subtracted, a new fractional unit will be generated. This fractional unit is relatively abstract and hidden. How to make students understand the essence of the alchemy fractional addition and subtraction algorithm, to effectively grasp the calculation method?