四年级数学简便计算题及答案.docx

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年级
学简便计算题及答案:
=1287
1)125x(17x8)x4
=125x8x4x17
=1000x68
=68000
2)375x480+6250x48
=480x(375+625)
=480000
3)25x16x125
=25x2x8x125
=50000
4)13x99
=13x(100-1)
=1300-13
=1287
)75000-125-15
=75x1000=125—15
=75-15x1000-125
=5x8
=40
)7900-4-25
=7900-(4x25)
=79
)150x40-50
=150-50x40
=3x40
=120
)5600-(25x7)
=56x100-25-7
=56-7x100-25
=32
9)210-42x6
=210-7-6x6
=30
10)39600一25
=396x100=25
=396x4
=1584
67x21+18x21+85x79
=21x(67+18)+85x79
=21x85+85x79
=85x(21+79)
=8500
321x81+321x19
=321x(81+19)
=32100
13)222222x999999
=222222x(1000000-1)
=222222000000-222222
=0
=222221777778
=0
14)333333x333333
=111111x999999
=111111x(1000000-1)
=1**********-111111
=1**********
15)56000一(14000-16)
=56000—14000x16
=4x16
=64
16)654321x909090+654321x90909
=654321x999999
=654321x(100000-1)
=654321000000-654321
=654320345679
17)34x3535-35x3434
=34x35x101-35x34x101
18)27000-125
=27x1000=125
=27x8
=216
19)345345=15015
=345x1001=(15x1001)
=345=15x1001=1001
=23
)347+358+352+349=350x4-3+8+2-1=1400+6
=1406
)75x45+17x25
=25x3x45+17x25
=25x(135+17)
=25x152
=25x4x38
=3800
22)599996+49997+3998+407+89
=600000+50000+4000-4-3-2+407+89
=65400+487
=65887
23)(48x75x81)=(24x25x27)
=48x75x81-24-25^27
=48-24x75^25x81-27
=2x3x3
=18