六年级数学简便计算练习题答案.doc

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1、1六年级数学总复习简便计算练习题一、口算。(10 分)102.657.35 03.8 0 90.08 0.72 240.460 67.50.2567.75 614.420.4 0.770.33=1.151.41.6=5-3=2 800.125=80* =10 3 = * =8173137491二、用简便方法计算下面各题。(90 分,42052)1125997 998+1246 4 +3.25 +6.8 12 (1 +2 ) 4001258 25(378)2527=1125-(1000-3) =(998+2)+(1246-2) =(4 5 )+(3.2+6.8)=12 -2 1 =400(125

2、*8)=25*8*3731=1125-1000+3 =1000+1244 =10+10=20 =10-1 =8 =4001000= =200*37=7400 52=125+3=128 =2244( )12 1 2 34(2 ) 1258.8 4.354.253.653.75 3.4993.44164357341=( )*12 = 2 =34234 =125*(8+0.8) =(4.35+3.65)+(4.25+3.75)=3.4*(99+1)2= *12 =( )*2 =68+13 =125*8+125*0.8 =8+8=16 =3.4*100=34014=1 =1*2 =2 =81 =100

3、0+100=11005217.158.471.53 17 3 4 2 0.1250.2532 22.32.455.34.5565975192=17.15-(8.47+1.53) =17 4 3 = = * *32 =22.3-5.3-(2.45+4.55)814=17.15-10 =13-3 =9 = * =1 =17-7=1011=7.15 =( ) =97251( + )72 4.253 (2 1 ) 187.711187.7 43 57.125 0.5 ( ) 12874565438721213415 57 314 34= 72 72+ 72 =4 +1 -(3 +2 ) =187.7*

4、(11-1) =43 57 = ( * )241 3415 57 314=11*6+7*4+5*3 =6-6=0 =1887 = (43 57 -1) = *( )21871957 2=66+28+15 = *100=50 = * =143=1092.42 +4.58 43 6.62.5 4.6+ + +5.4 2.8+ +7.2+ ( + )431212 635 1178 613 123 325635 549 359 445 245 512=2.42* +4.58 - *1 =2 *6 2 *6 = ( + ) =4 +3 +6 +5 =(2.8+7.2)+5 +3 = -34 1178 6

5、13123 29445 2455123= (2.42+4.58-1) =2 *2*6 = 8=3 =4 +5 +(3 +6 )=10+9=19 =2- =1341531178 525512 7= *6=8 =10+10=20+2.25+ + + + + + + + 0.75+ + +0.375 5- -438 558734 725457235 53611 164716511 237359 337149147 5814 214171317=4 +2 +5 +7 = + + = + = + +( + )= + + + =5-( + )1725235457 5361116511 1647 23714

6、7 337 359149 3214171317=4 +5 +(2 +7 )=10+ =70- = +5=5 = + +( + )=2 =5-4=18354457 1647 485=10+10=20 =14 =53 3 + + + 48.3- - 4.25+ 6 0.6250.5+ + 62.5% +( -1.8)45 945994599945999945 1516456 956 414 5812 3138 72513 3138 1645 247=(1+9+99+999+9999) = 48.3-( + )=9 *4 +4 * = * + * * = = +( -1 )45 1516456 31

7、38 3138 72513 1645 247=11107 =48 -20=28 =(9 + )*4 = *( + +1) =1 = = -1 +45 10361485217251372513 1645 2474=10* = =15 + =18417285 54247 312.5( + + + ) 22 +2575%-70.75 0.2563.5 2.5- +3.125+ + 1125-996910 910 910 910 34 14 1312 6715 212 4715 389 119178=2 *4* =22* +25* -7* = *63 - *13 =6 *2 -2 *4 = + +(3

8、 + )=1125-(1000-4)2 43 389119 178= *4* =10* =9 =(22+25+7)* = = *(63 -13 ) =(6 -4 )*2 =5+5=10 =1125-1000+45109271421572= *50=12 =2* =5 =125+4=12912(111+999) 56( - ) 49.5 -(50- )0.6 + + 45( + 0.6) 897 37.5%+104 0.375 3738 1035 12 711 414195519 147 711 79 415 38=110+( 1+999)/(56 -56 )=49 * -49 = + * +

9、=45*( + - ) =897 +104 37 38 1035 12 711 414195519711 711 383=(110+1000 )(24-21 ) =49 (10 - ) = ( + +1) =45* +45* -45* =(897-1+104)711 414195519 97154=1110* =49 *10=495 = *11=7 =35+12-27=20 =(896+104 ) =1000 =3753121711 83( 5.375) 3.5 +1.25 +3.8 72156-5672 2532125 70999+709 299101314 538 114 2710 45=

10、 *(5 -5 ) =3 *1 +1 *2 +3 * =72*(156-56 ) =25*(8*4)*125 =709(99+1) 5=0 =(3 +2 +3 )* =72*100 =25*8*(4*125) =709*100210754=( +2 + )* =7200 =200*500=100000 =709009=( +2 + )*1384563999 7199 3755+2996 8439+1001 446+295 888+999 2100202 6.6+2.56 75.399+75.3 4.63.7+540.37 0.125 + 8.25+12.5% 8.37-3.25-(1.37+1

11、.75) 12 35 3418=2 *6 +2 *6 =75.3*(99+1) =4.6*3.7+5.4*3.7 = * + *8 + =8.37-1.37-(3.25+1.75)=2 ( 6 +6 ) =75.3*100 =(4.6+5.4)*3.7 = ( + +1) =7-5=22153 8143=2 *12 =7530 =10*3.7 = *2= * =33 =3711 6 1 15 4.255 19.826.573.43 78 13 23 314 344.6+3 +6 +5.4 4 +2.25+5 +7 9.632.54 25 35 38 58 34660.25=11 -(6 +1

12、)=15 -(4 +5 )=19.82-(6.57+3.43)=4.6+5.4+(3 +6 )=4 +5 +(2 +7 )=9.63/(2.5*4) =6/8731213 5238541341=11 -8 =3 =15 -10=5 =19.82-10=9.82 =10+10=20 =10+10=20 =9.63/10=0.963 =6*4=243 + + 18( + ) 7+ 5 ( )(24 )71257385781562710949562316245=3-( + ) = ( + ) = * + * =18* +18* = *(7+5) = *24- *3=3-1=2 = = * + * =

13、2*4+3*5 = *12 =2- =1154= + = =8+15=23 =2*4=861( + ) ( + ) 7+ 5 ( ) ( )1511 12103450075 5747152312318 12 35 109 215 311=( +1)* * = /( + ) = (7+5) = *( * ) = *165+ *16596=1 = * + *65 =2*4=8 = * = =2*11+3*1575512 81432= +13=16 =22+45=67037(32 17)(25 ) (21 21) (99 )9 412543125816971697341105468=( 8+17)*

14、 =25*4+ *4+ =( + +1) =21( + )* =99* + * = * *=25* =100+3+ =2* = =1 =21* =5 =11+ =11 = =15 841 1=5*12=60 =103 41( ) ( )30 3 4 58 4115432106512651091578181= /( * + * ) = *30+ *30 = +3*2 =1- =4-( + ) = *(58+41+1)4= /( + ) =25+24=49 =6 = =4-1 =2 = *100=128 3 02= / = * =1543107 ( ) 235 - 13518 153 0.653 ( ) 725462354821535 45 14 73 710= - = +( * ) = /( * ) = *(153-53 )43= = *2=1 = / = *5=4 = *100=3*20=6011541 53810 - - + 25 13.098.124.88 7191219 119 13 52 310=10-( + )+ =25* * * =13.09-(8.12+4.88)=10-1+ = =6 =13.09-13=0.091945=9

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