三年级数学下册三《乘法》电影院基础练习1北师大版.doc

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1电影院1.仔细想,认真填。(1)29 大约是( ) 。 (2)403 大约是( ) 。(3)2929 大约等于( ) 。 (4)5004 大约是( ) 。2.填空。(1)估算 4832 时,把 48 看作( ) ,把 32 看作( ) ,积大约是( ) 。(2)估算 7429 时,把 74 看作( ) ,把 29 看作( ) ,积大约是( ) 。还可以把 74 看作( ) ,积大约是( ) 。3.连一连。2434 6084523 3503816 8162514 10354.竖式计算我最棒!3718= 5625= 3926= 7832=1 8372 562 6393 278答案1.(1)30 (2)400 (3)900 (4)50002.(1)50 30 1500(2)70 30 2100 75 22503. 4.666 1400 1014 24962

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