三年级数学下册三《乘法》找规律基础练习1北师大版.doc

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1找规律1.算一算。230= 440= 1230= 1820=1320= 2420= 2620= 1640=2.填表。乘数 21 11 32 22 28乘数 30 50 50 40 20积3.夺红旗。(1)60 30 ( ) 2 ( ) 5 ( ) 10 ( )(2)80 20 ( ) 2 ( ) 8 ( ) 10 ( )(3)40 30 ( ) 2 ( ) 5 ( ) 10 ( )4.直接写得数。230= 450= 2030= 4050=1420= 2610= 14020= 26010=答案1.60 160 360 360 260 480 520 6402.630 550 1600 880 5603.(1)1800 3600 18000 180000(2)1600 3200 25600 256000(3)1200 2400 12000 1200004.(竖排)60 600 280 2800200 2000 260 26002

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