五年级数学下册第6章分数的加法和减法6.1同分母分数加、减法课件新人教版.ppt

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6 分数的加法和减法,同分母分数加、减法,(1)从图中,你获得了哪些数学信息?(2)根据这些信息,你能提出什么数学问题?,问题1:爸爸和妈妈一共吃了多少张饼?,你能计算出结果吗?请试一试。,计算的结果,能约分的要约成最简分数。,2,1,问题2:爸爸比妈妈多吃了多少张饼?,4,1,(1)思考: 和 可以直接相减吗?为什么?,(2)请你试着算一算。,问题: 1观察两个算式,有什么共同点吗? 2你能用一句话概括同分母分数加、减法的计算法则吗?,同分母分数相加、减,分母不变,只把分子相加、减。计算的结果,能约分的要约成最简分数。,1列式并计算。,2计算。,3,2,5,3,3春蕾小学图书馆中各类图书情况如图所示。 (1)社会科学、自然科学和文艺类图书共占 图书总量的几分之几? (2)其他图书占图书总量的几分之几?,答:社会科学、自然科学和文艺类图书共占图书总量的 , 其他图书占图书总量的 。,通过本节课的学习,你有什么收获?你对自己在本节课的表现,如何评价?,作业,请完成教材第91页练习二十三第3,4,5题。,xx小学 x年级x班,xxx,

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