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为什么会把分母也相加?六年制小学数学课本第十册中归纳总结了这样一段话:“分数加减法的意义和整数加减法的意义相同。同分母分数相加减,把分子相加减,分母不变。”分母不变,这里讲得十分明白,而有的学生在计算分数加法时,分母也在相加。如3/7+2/7=5/14,1/2+1/3=2/5。我分析了学生产生计算错误的原因,主要是没有真正理解与掌握同分母分数加法的计算法则。
Why does the denominator also add? Six years of primary school mathematics textbooks in the tenth volume summed up the following passage: “The meaning of the fractional addition and subtraction and integer addition and subtraction of the same meaning .Core and denominator fractional addition and subtraction, the numerator Add minus, denominator unchanged. ”Denominator invariably speaks very clearly here, while some students in the calculation of fractional addition, the denominator is also added. Such as 3/7 + 2/7 = 5/14, 1/2 + 1/3 = 2/5. I analyzed the reasons why students make mistakes in calculation, mainly because they did not really understand and grasp the law of calculating the addition of the same denominator.