整数乘除法简便计算分类练习题(带答案).doc

精品文档整数乘除法简便计算分类练习题1、凑整2532125=(254)(8125)=1001000=100000 93712525645=937(1258) (254) (52)=937100010010=937000000801625125=(80125) (254) 4=100001004=40000001255325=(1258) (52) (52)=10001010=10000056125 =7(8125)=71000=70002、利用乘法分配律简算46101=46(100+1)=46100+461=4600+46=4646 17999=17(1000-1)=17000-17=16983 12598=125(100-2)=12500-250=122503799=37(100-1)=3700-37=3663 234102=234(100+2)=23400+468=23868(1004)25=10025-425=2500-100=24003、逆用乘法分配律简算 95719529=95(71+29)=95100=95006425352525=25(64+35+1)=25100=250012323524235235=235(123-24+1)=235100=235 5861242958658653=586(124+29-53)=586100=5860062383838=38(62+38)=38100=3800 541544554549=54(154-45-9)=54100=540067126735675267=67(12+35+52+1)=67100=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)21000125=210008(1258)=1680001000=168 1105=1102(52)=22010=22 44000125=440008(1258)=3520001000=352 47700900=47700100(900100)=4779=535、利用除法分配律简算(9988)11 =9911+8811=9+8=1725131413=(25+14) 13=3913=313959=(13+5) 9=189=2315325335345=(31+32+33+34) 5=1305=26 1871263125212=(187-63-52) 12=7212=6(12243648)6=126+246+366+486=2+4+6+8=20 21565=(21-6) 5=155=36、利用乘除法的带符号“搬家”进行简算3604060=3606040=640=240 99883322=(9933) (8822)=32=62789=2798=38=24 684=648=248=37、 乘除同级运算的去括号法则 25(443)=25443=10043=430045000(2590)=450009025=50025=20125(837)=125837=100037=37000 562397(281397)=(562281) (397397)=21=25600(14004)=560014004=44=168、乘除同级运算的括号法则310008125=31000(8125)=310001000=31 1320500250=1320(500250)=13202=264035222111 =35(222111)=352=7037500425=37500(425)=37500100=375610001258=6100