二年级数学下册第7章万以内数的认识6万以内数的大小比较课件新人教版.ppt

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1、一 、贴近生活,激趣导入,老师想买一台彩电,逛了两家商店,发现我看中的同一型号的TCL彩电在A商店售价为1980元,在B商店售价为2015元。,A商店,B商店,比一比。,请你帮老师比一比,在哪家店里买比较便宜?说说理由。,二、自主学习,探究新知,根据图中提供的信息,自主选择两种电视机比一比价格。,二、自主学习,探究新知,940是三位数,1899是四位数,(1)比较1号和2号彩电的价格,方法二:,方法一:,因为940在1899的前面,二、自主学习,探究新知,(2)比较3号和4号彩电的价格,1350最高位上的1表示1个千,,2365最高位上的2表示2个千,二、自主学习,探究新知,(2)比较2号和3

2、号彩电的价格,先独立完成,然后小组内交流比较方法。,940 1350 1899 2365,我把它们竖着排:,940,1899,1350,2365,三位数,940135018992365,940 1899,1899 1350,1350 2365,把这四种电视机的价格从小到大排列。,二、自主学习,探究新知,398,402,1020 999,7878 8787,9812 9182,5667 5680,1.快速比较大小。,1111 1119,587 5870,在下表中填入合适的交通工具。,2.一列火车坐的人比一架飞机多得多,一架飞机坐的人比一艘客轮少一些。,火 车,飞 机,客 轮,1500,300,350,三、运用新知,深化理解,3.从09这10张卡片中,抽取4、8、7、1这4张卡片,组成最大的四位数、最小的四位数、第二大的四位数、第二小的四位数。,最大的四位数是( ),最小的四位数是( )。 第二大的四位数是( ),第二小的四位数( )。,8741,1478,8714,1487,三、运用新知,深化理解,4里最大能填几?4579 76471 100099,7,2,6,9,这节课我学会了什么?快来说一说吧!,课本第92页练习十八,第2题。,xx小学 x年级x班,xxx,

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