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第,8,课时,乘数末尾有0的乘法,第一单元 两、三位数乘一位数,复习导入,算一算。,5201,1005,4601,2404,3057,2135,5046,3024,1043,312,3038,2424,新知讲解,10,一共有多少人?,同学们排成,4,个方队表演团体操,每个方队,120,人。,新知讲解,你怎么计算?,4120,(,),480,人,10,同学们排成,4,个方队表演团体操,每个方队,120,人。一共有多少人?,0,4,1,2,8,0,4,新知讲解,4120,(,),480,人,10,同学们排成,4,个方队表演团体操,每个方队,120,人。一共有多少人?,0,4,1,2,8,0,4,答:一共有,480,人。,试一试,6380,2280,0,6,3,8,8,0,2,4,2,2,归纳总结,计算乘数末尾有,0,的乘法:,先看多位数末尾有几个,0,,就在积的末尾添上几个,0,,再用一位数去乘多位数末尾前面的数,。,想想做做,1,、,0,2,2,6,0,3,1,8,5,2,0,4,0,5,0,4,3,5,0,5,8,2,0,0,4,2,2,1,0,0,1,1,4,1,1,4,想想做做,2,、先找出错在哪里,再改正。,想想做做,3,、,3103,0,3,3,1,9,3,0,9420,0,9,4,2,7,8,0,1,2504,0,4,2,5,0,0,0,2,5360,0,5,3,6,8,0,0,3,3,1,1,3,1,1,930,3780,1000,1800,想想做做,3,、,8400,0,8,4,0,2,0,0,6130,0,6,1,3,7,8,0,1,6002,0,2,6,0,2,0,0,1708,0,8,1,7,3,6,0,5,1,1,3,3,1,1,3200,780,1200,1360,想想做做,4,、,3078,61203,51027,2108,1680,7203,2160,5107,3570,想想做做,5,、小红家养了,5,匾蚕,平均每匾能收,180,个蚕茧。你能把下表填写完整吗?,匾的个数,1,2,3,4,5,蚕茧的个数,180,360,540,720,900,想想做做,6,、松树有,130,棵,柳树的棵树是松树的,3,倍。,答:柳树有,390,棵,松树和柳树一共有,520,棵。,1303,390,(棵),柳树有多少棵?松树和柳树一共有多少棵?,130,390,520,(棵),谢 谢 观 看!,
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