六年级数学简便计算练习题答案.pdf

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1、优秀学习资料欢迎下载 六年级数学总复习简便计算练习题 一、口算。( 10 分) 102.65 7.35 03.8 0 90.08 0.72 240.4 60 67.50.2567.75 614.4 20.4 0.770.33=1.1 51.4 1.6=5-3=2 800.125=80* 8 1 =10 7 3 3 7 1 = 7 3 * 3 1 7 1 = 49 1 二、用简便方法计算下面各题。(90 分,42052) 1125997 998+1246 4 3 1 +3.25 3 2 +6.8 12 5 2 (1 7 2 +2 5 2 ) 4001258 25(378) =1125-(1000

2、-3) = (998+2)+(1246-2) =(4 3 1 5 3 2 )+(3.2+6.8 )=12 5 2 -2 5 2 1 7 2 =400(125*8)=25*8*37 =1125-1000+3 =1000+1244 =10+10=20 =10-1 7 2 =8 7 5 =4001000= 5 2 =200*37=7400 =125+3=128 =2244 ( 4 1 6 1 ) 12 1 4 3 2 15 4 7 4 34(2 34 13 ) 1258.8 4.354.25 3.65 3.75 3.4993.4 =( 24 6 24 4 )*12 = 4 72 15 4 7 4 =

3、34234 34 13 =125*(8+0.8) = (4.35+3.65 )+(4.25+3.75 )=3.4* (99+1) = 24 2 *12 =( 4 7 7 4 )*2 15 4 =68+13 =125*8+125*0.8 =8+8=16 =3.4*100=340 =1 =1*2 15 4 =215 4 =81 =1000+100=1100 优秀学习资料欢迎下载 17.15 8.47 1.53 17 6 5 3 4 3 4 6 5 9 7 2 5 1 11 5 9 2 0.1250.25 32 22.32.45 5.3 4.55 =17.15- (8.47+1.53 ) =17 6

4、 5 4 6 5 3 4 3 = 9 7 5 11 11 5 9 2 = 8 1 * 4 1 *32 =22.3-5.3-(2.45+4.55 ) =17.15-10 =13-3 4 3 =9 4 1 = 9 7 * 11 5 11 5 9 2 =1 =17-7=10 =7.15 =( 9 7 9 2 ) 11 5 = 11 5 ( 12 11 18 7 + 24 5 )72 4.253 6 5 (2 6 1 1 4 3 ) 187.711187.7 43 8 7 2 1 57.125 2 1 0.5 3 4 15 (5 7 3 14 3 4 ) = 12 11 72 18 7 72+ 24

5、5 72 =4 4 1 +1 4 3 - (3 6 5 +2 6 1 ) =187.7*(11-1 ) =43 8 7 2 1 57 8 1 2 1 2 1 =3 4 15 (5 7 3 14 * 3 4 ) =11*6+7*4+5*3 =6-6=0 =1887 = 2 1 (43 8 7 57 8 1 -1) = 15 49 *(5 7 7 2 ) =66+28+15 = 2 1 *100=50 = 15 49 * 7 3 = 5 7 =109 2.42 4 3 +4.58 3 1 14321 2 6.62.563 5 117 8 61 3 12 3 4.6+32 5 +63 5 +5.4

6、2.8+5 4 9 +7.2+3 5 9 44 5 (24 5 + 5 12 ) =2.42* 3 4 +4.58 3 4 - 3 4 *1 =2 2 1 *6 5 3 2 2 1 *6 5 3 =117 8 ( 61 3 +12 3 )=4 5 3 +3 5 2 +6 5 3 +5 5 2 =(2.8+7.2 )+5 9 4 +3 9 5 =4 4 5 24 5 - 5 12 = 3 4 (2.42+4.58-1 ) =2 2 1 *2*6 5 3 =117 8 8=3 8 7 =4 5 3 +5 5 2 +(3 5 2 +6 5 3 )=10+9=19 =2- 5 12 =1 12 7 =

7、 3 4 *6=8 =10+10=20 优秀学习资料欢迎下载 43 8 +2.25+55 8 +73 4 72 5 +45 7 +23 5 53 6 11 164 7 +16 5 11 23 7 +35 9 33 7 +14 9 +14 7 0.75+5 8 + 1 4 +0.375 5-2 14 17 -1 3 17 =4 8 3 +2 4 1 +5 8 5 +7 4 3 =72 5 +23 5 +45 7 =53 6 11 +16 5 11 164 7 =23 7 +1 4 7 33 7 +(35 9 +14 9 ) = 4 3 + 8 5 + 4 1 + 8 3 =5-( 214 17

8、+1 3 17 ) =4 8 3 +5 8 5 +(2 4 1 +7 4 3 )=10+45 7 =70-16 4 7 = 7 4 +5=5 7 4 = 4 3 + 4 1 +( 8 5 + 8 3 )=2 =5-4=1 =10+10=20 =14 7 5 =53 7 3 4 5 94 5 +99 4 5 +9994 5 +99994 5 48.3-15 1 6 -45 6 95 6 4.25+4 1 4 6 0.6250.5+ 5 8 + 1 2 62.5% 313 8 72 5 13 313 8 164 5 +(24 7 -1.8) =(1+9+99+999+9999 ) 4 5 = 48

9、.3-(151 6 +45 6 )=9 6 5 *4 4 1 +4 4 1 * 6 1 = 8 5 * 2 1 + 8 5 * 2 1 * 8 5 =313 8 313 8 72 5 13 =16 4 5 +(2 4 7 -1 5 4 ) =11107 4 5 =48 10 3 -20=28 10 3 = (9 6 5 + 6 1 )*4 4 1 = 8 5 *( 2 1 + 2 1 +1) =172 5 13 =72 5 13 =164 5 -1 5 4 +24 7 =10* 4 17 = 2 85 =15 5 4 +24 7 =18 35 13 2.5( 9 10 + 9 10 + 9 1

10、0 + 9 10 ) 22 3 4 +2575%-7 0.75 0.25 63.5 1 4 131 2 6 7 15 2.5-2 1 2 4 7 15 38 9 +3.125+1 1 9 +17 8 1125-996 =2 2 1 *4* 10 9 =22* 4 3 +25* 4 3 -7* 4 3 = 4 1 *63 2 1 - 4 1 *13 2 1 =6 15 7 *2 2 1 -2 2 1 *4 15 7 =38 9 +1 1 9 +( 3 8 1 +1 7 8 )=1125-(1000-4) = 2 5 *4* 10 9 =10* 10 9 =9 =(22+25+7)* 4 3 =

11、2 71 = 4 1 *(63 2 1 -13 2 1 ) =(6 15 7 -4 15 7 )*2 2 1 =5+5=10 =1125-1000+4 = 4 1 *50=12 2 1 =2* 2 5 =5 =125+4=129 优秀学习资料欢迎下载 (111+999) 56(3 7 -3 8 ) 49.5103 5 -(50- 1 2 )0.6 7 11 414 19 +5 5 19 14 7 + 7 11 45(7 9 + 4 15 0.6) 897 3 8 37.5%+104 0.375 =110+(1+999)/(56 3 7 -56 3 8 ) =49 2 1 *103 5 -491

12、 2 5 3 = 7 11 414 19 +5 5 19 * 7 11 + 7 11 =45* ( 9 7 + 15 4 - 5 3 ) =897 8 3 8 3 +104 8 3 =(110+1000)( 24-21)=49 2 1 (10 5 3 - 5 3 ) = 7 11 (414 19 +5 5 19 +1)=45* 9 7 +45* 15 4 -45* 5 3 = (897-1+104) 8 3 =1110* 3 1 =49 2 1 *10=495 = 7 11 *11=7 =35+12-27=20 =(896+104) 8 3 =1000 8 3 =375 31 4 (53 8

13、5.375) 3.511 4 +1.252 7 10 +3.8 4 5 72156-5672 2532125 70999+709 299101 = 4 13 * (5 8 3 -5 8 3 ) =3 2 1 *1 4 1 +1 4 1 *2 10 7 +3 5 4 * 4 5 =72*(156-56)=25*(8*4)*125 =709(99+1) =0 =(3 2 1 +2 10 7 +3 5 4 )* 4 5 =72*100 =25*8* (4*125)=709*100 =( 2 7 +210 7 + 5 19 )* 4 5 =7200 =200*500=100000 =70900 =(

14、10 35 +2 10 7 + 10 38 )* 4 5 563999 7199 3755+2996 8439+1001 446+295 888+999 210020 优秀学习资料欢迎下载 21 26.6+2.56 3 5 75.399+75.3 4.63.7+540.37 0.1253 4+ 1 88.25+12.5% 8.37-3.25-(1.37+1.75) =2 2 1 *6 5 3 +2 2 1 *6 5 3 =75.3*(99+1) =4.6*3.7+5.4*3.7 = 8 1 * 4 3 + 8 1 *8 4 1 + 8 1 =8.37-1.37-(3.25+1.75 ) =2

15、2 1 (6 5 3 +6 5 3 ) =75.3*100 =(4.6+5.4 )*3.7 = 8 1 ( 4 3 + 4 1 +1) =7-5=2 =2 2 1 *12 5 6 =7530 =10*3.7 = 8 1 *2= 4 1 = 2 5 * 5 66 =33 =37 11 7 86 1 31 2 3 15 3 144.255 3 4 19.826.573.43 4.6+32 5+6 3 5+5.4 43 8+2.25+5 5 8+7 3 4 9.632.54 60.25 =11 8 7 - (6 3 1 +1 3 2 )=15 14 3 - (4 4 1 +5 4 3 )=19.82

16、- (6.57+3.43 )=4.6+5.4+ (3 5 2 +6 5 3 )=4 8 3 +5 8 5 +(2 4 1 +7 4 3 )=9.63/ (2.5*4 ) =6/ 4 1 =11 8 7 -8 =3 8 7 =15 14 3 -10=5 14 3 =19.82-10=9.82 =10+10=20 =10+10=20 =9.63/10=0.963 =6*4=24 3 7 12 5 12 5 7 3 8 + 5 8 5 7 8 15 5 16 + 5 27 10 9 18( 4 9 + 5 6 ) 2 3 7+ 2 3 5 ( 1 6 1 12 )( 24 4 5 ) =3-( 12

17、 7 + 12 5 )= 7 5 ( 8 3 + 8 5 ) = 3 1 * 2 1 + 27 5 * 10 9 =18* 9 4 +18* 6 5 = 3 2 *(7+5) = 12 1 *24- 12 1 * 5 4 =3-1=2 = 7 5 = 3 1 * 2 1 + 3 1 * 2 1 =2*4+3*5 = 3 2 *12 =2- 15 1 =1 15 14 = 6 1 + 6 1 = 3 1 =8+15=23 =2*4=8 优秀学习资料欢迎下载 ( 5 7 4 7 + 4 7 ) 4 7 1 5 ( 2 3 + 1 5 ) 1 13 2 3 7+ 2 3 5 1 8 1 2 (3 5

18、 10 9 ) ( 2 15 3 11 )1511 12103450075 =( 7 5 +1)* 7 4 * 4 7 = 5 1 / ( 39 2 + 65 1 ) = 3 2 (7+5) = 8 1 * ( 2 1 * 2 3 )= 15 2 *165+ 11 3 *165 =1 7 5 = 5 1 * 2 39 + 5 1 *65 =2*4=8 = 8 1 * 4 3 = 32 3 =2*11+3*15 = 10 39 +13=16 10 9 =22+45=67 (32 4 1 17) 12 5 (25 4 3 ) 4 1 4 1 25 18 16 9 25 7 16 9 16 9 (2

19、1 7 3 7 4 21) 4 1 (99 10 9 )9 5 4 6 5 8 5 =(8+17)* 5 12 =25*4+ 4 3 *4+ 4 1 =( 25 18 + 25 7 +1) 16 9 =21( 7 3 + 7 4 )* 4 1 =99* 9 1 + 10 9 * 9 1 = 5 4 * 6 5 * 5 8 =25* 5 12 =100+3+ 4 1 =2* 16 9 = 8 9 =1 8 1 =21* 4 1 =5 4 1 =11+ 10 1 =11 10 1 = 15 16 =115 1 =5*12=60 =103 4 1 15 14 ( 5 4 3 2 ) 11 10 (

20、6 5 5 4 )30 3 1 3 2 1 6 5 5 6 10 9 5 9 4 11 5 11 7 8 1 58 8 1 41 8 1 = 15 14 / ( 5 4 * 11 10 + 3 2 * 11 10 ) = 6 5 *30+ 5 4 *30 = 3 1 +3*2 =1- 2 1 =4-( 11 5 + 11 7 ) = 8 1 * (58+41+1) = 15 14 / ( 11 8 + 33 20 ) =25+24=49 =6 3 1 = 2 1 =4-1 11 1 =2 11 10 = 8 1 *100=12 2 1 = 15 14 / 33 44 = 15 14 * 4 3

21、 = 10 7 优秀学习资料欢迎下载 5 4 7 4 4 5 2 1 5 4 6 5 5 2 5 3 5 4 ( 8 5 2 1 ) 8 5 235 - 13518 3 5 153 0.653 ( 4 5 1 4 ) 7 3 7 10 = 7 4 - 2 1 = 3 2 +( 5 2 * 3 5 ) = 5 4 / ( 8 1 * 5 8 ) = 5 3 * (153-53) = 14 1 = 3 2 *2=1 3 1 = 5 4 / 5 1 = 5 4 *5=4 = 5 3 *100=3*20=60 10 - 7 19 - 12 19 + 1 19 25 1 3 5 2 3 10 13.098.12 4.88 =10-( 19 7 + 19 12 )+ 19 1 =25* 3 1 * 2 5 * 10 3 =13.09-(8.12+4.88 ) =10-1+ 19 1 = 4 25 =6 4 1 =13.09-13=0.09 =9 19 1

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