三年级数学下册2《除数是一位数的除法》口算除法课课练新人教版.doc

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1口算除法一、填一填。1.估算 2014时,可以把 201看作( ) ,因为( )4( ) ,所以2014( ) 。2.890里面有( )个百和( )个十。3.1800是 6的( )倍,是 3的( )倍。二、用两种读法读算式,再口算出得数。303= 606 402602 3003 800044004 455 723三、在内填、或。4509010010 2404048080120302200 4290090四、三年级有 50人参加大合唱,四年级有 34人参加大合唱,平均站成 4行,每行有多少人?五、一头大猪重 280千克,一头小猪重 40千克,这头大猪的体重是小猪的多少倍?六、三年级有 50人参加大合唱,四年级有 34人参加大合唱,平均站成 4行,每行有多少人?2参考答案一、1. 200;200;50;50。2. 8;9。3. 300;600。二、10;10;20;30;100;2000;100;9;24三、;四、21 人五、7 倍六、21 人

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