一年级数学下册第7章大海边—100以内数的加减法(二)7.5连加、连减、加减混合两步计算课件青岛版六三制.ppt

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一、情境导入,从图中,你知道了哪些数学信息?根据这些信息,你能提出什么数学问题?,5 0,-1 3,3 7,3 7,-1 7,2 0,20,用50元钱去买一个 和一个 ,还剩多少元钱?,20,用50元钱去买一个 和一个 ,还剩多少元钱?,5 0,-1 3,3 7,-1 7,2 0,2 0,观察比较一下,这两种竖式有什么联系与区别?,20,5 0,-1 3,3 7,3 7,-1 7,2 0,先算一共用去多少钱。,13+17=30(元),再算剩下多少钱。,50-30=20(元),第一步:,第二步:,用50元钱去买一个 和一个 ,还剩多少元钱?,这道题还可以 分两步解答。,2 3,+ 2 5,4 8,+ 1 3,1,1,23+25+13=,61(元),6,要买 、 和 ,一共需要多少元?,想一想,计算连加、连减时应该注意什么?,这三个月一共有多少天?,1.,293130=,90(天),2,5,52,2.火眼金睛辨对错:,92-27+15=80(人),现在一共有多少位客人?,3.,这节课我学会了什么?快来说一说吧!,作业,请完成教材第8183页自主练习第二、第三、第六、第八题。,xx小学 x年级x班,xxx,

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