完整版整数乘除法简便计算分类练习题带答案

整数乘除法简便计算分类练习题1、凑整25X32X125=(25X4)X(8X125)=100X1000=100000937X125X25X64X5=937X(125X8)X(25X4)X(5X2)=937X1000X100X10=93700000080X16X25X125=(80X125)X(25X4)X4=10000X100X4=4000000125X5X32X5=(125X8)X(5X2)X(5X2)=1000X10X10=10000056X125=7X(8X125)=7X1000/9=70002、利用乘法分配律简算46X101=46X(100+1)=46X100+46X1=4600+46=464617X999=17X(1000-1)=17000-17=16983125X98=125X(100-2)=12500-250=1225037X99=37X(100-1)=3700-37=3663234X102=234X(100+2)=23400+468=23868(100—4)X25/9=100X25-4X25=2500-100=2400、逆用乘法分配律简算395X29+95X71=95X(71+29)=95X100=95002535X25++64X25=25X(64+35+1)=25X100=2500235+24X235123X235—=235X(123-24+1)=235X100=235586X5329X586+—586X124=586X(124+29-53)=586X100=5860038X38+62X38/9=38X(62+38)=534=534/9=38X100=380054X154—45X54—54X9=54X(154-45-9)=54X100=540067X12＋67X35＋67X52＋67=67X(12+35+52+1)=67X100=67004、利用商不变的性质简算(分子分母同时乘以相同的数、商不变)21000三125=21000X8三(125X8)=168000三1000=168110三5=110X2三(5X2)=220^10=2244000三125=44000X8三(125X8)=352000三1000=35247700三900=47700三100三(900三100)=477三9、利用除法分配律简算588)三11+(99=99三11+88三11=9+8=1714F13+25^13=(25+14)213=39^13=35291329+=(13+5)29=1829=23425+3225+3325+3125=(31+32+33+34)25=13025=265221263212－187212－=(187-63-52)212=72212=6/9(12+24+36+48)26=1226+2426+3626+4826=2+4+6+8=202125－625=(21-6)三5=15三5=36、利用乘除法的带符号“搬家”进行简算360X40F60=360^60X40=6X40=24099X88三33三22=(99三33)X(88^22)=3X2=627X8三9=27三9X8=3X8=246F8X4/9=6X428=24三8=37、乘除同级运算的去括号法则25X(4X43)=25X4X43=100X43=4300450002(25X90)=45000^90225=500225=20125X(8X37)=125X8X37=1000X37=37000562X3972(281X397)=(5622281)X(3972397)=2X1=256002(140024)=560021400X4/9=4X4=16=619=619/98、乘除同级运算的括号法则31000^8^125=31000^(8X125)=31000^1000=311320X500三250=1320X(500三250)=1320X2=264035X2222111=35X(222^1