二年级数学下册五《加与减》1买电器课件2北师大版.ppt

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1、口 算,1620,36,547,61,4040,80,195,24,218,29,365,41,4810,58,3023,53,7020,90,2370,93,看计数器填空,万 千 百 十 个,万 千 百 十 个,万 千 百 十 个,万 千 百 十 个,万 千 百 十 个,万 千 百 十 个,写作( ),,写作( ),,写作( ),,有( )个十。,有( )个百。,有( )个百。,340,34,1400,14,4,400,买电器,是一个整百数, 在400和600之间,9个百6个十组成,8张100元 的人民币,是一个三位数, 它的百位数是2, 十位和个位都是0。,500元,960元,800元,2

2、00元,猜猜村长要买哪两样家电?,一共要花多少钱呢?,500800,1,2,3,4,100,数线法,计数器,个百,个百,个百,分解法,500800=,500,300,500,1300,1000,500,800,1300,元,答:买1台洗衣机和1台电视机一共花1300元。,800500,800,500,100,个百,个百,个百,300,元,答:买1台冰箱和1台电扇一共要花1160元。,960+200=,1160(元),960-200=,答:买1台电扇比1台冰箱便宜760元。,760(元),买1台洗衣机和1台冰箱一共多少元? 买1台洗衣机比买1台电扇贵多少元? 买1台洗衣机和1台电扇一共多少元?

3、买1台电视机比买1台冰箱少多少元? 买1台电扇和1台电视机一共多少元? 买1台电视和1台冰箱一共多少元? 买1台电视比买1台电扇贵多少元? 买1台洗衣机比买1台电扇贵多少元? 买1台电视机和1台冰箱一共多少元? 买1台冰箱比买1台电视机贵多少元? 买1台洗衣机和1台冰箱一共多少元? 买1台冰箱比买1台洗衣机贵多少元?,(1)30040 = 700,(3)730500 = 780,(4)42002000 = 4000,(5)400160 = 500,(2)5600500 = 600,340,5100,1230,2200,560,第一关,430,250,70,610,1230,230,2000,1600,在里填上“”、“”或“”,28030028030,6400406400400,7504040 750,96080900 80,第二关,第三关,第四关,第五关,我 一 定 会 回 来 的 !,你今天收获了什么?,小结:,整十、整百数的加减口算与百以内数的加减法计算方法相同,只是数的范围扩大了,计算时注意相同数位上的数才能相加减。,作业:,1、完成口算题卡练习。 2、回家计算一下家里电器花多少钱。,

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