六年级数学简便计算练习题答案

六年级数学简便计算（一）练习题及答案

、口算。（10 分）

10-2.65 = 7.35 0 - 3.8 = 0 9 X 0.08 = 0.72 24 - 0.4 = 60 67.5 + 0.25 = 67.75 6 + 14.4 = 20.4 0.77 + 0.33=1.1

1 3 13 1 11

5- 1.4 —1.6=5-3=2 80 X 0.125=80* 1=10 - - 3X -=-*- X 丄二丄

8 7 7 7 3 7 49

二、用简便方法计算下面各题。(90分，4X 20+ 5X2)

1125—997 998+1246 4 1 2

丄+3.2 + 52 3 4+6.8

3 3

12

2

5

2 2 (1 - +2

兰) 400 -125-8 25 X( 37 X 8)

7 5

=1125- (1000-3)=(998+2)+ (1246-2 )= 1 2

(41+ 5- ) + (3.2+6.8

2

=122-2

2 —12 =400-( 125*8)=25*8*37

3 3 5 5 7

=1125-1000+3 =1000+1244 =10+10=20 =10-1 2 =8? =400 2

-1000丄=200*37=7400

7 7 5 =125+3=128 =2244

（丄-丄) X12 1 3X 2—X -34 13

X (2 + 竺)

125 X 8.8 4.35 + 4.25 + 3.65 + 3.75 3.4 X 99+ 3.4

4 6 4 1

5 7 34

2 7 4 4

= — *12 = (-X -) *2 —=68+13 =125*8+125*0.8 =8+8=16 =3.4*100=340 24 4 7 15

4 4

=1 =1*2 =2 =81 =1000+100=1100

15 15

1

=( 6 ——)*12 = 7 4 4

-X2—X -=34

X 2 + 34

X

13 =125* (8+0.8)= (4.35+3.65 ) + (4.25+3.75 )=3.4* (99+1)

24 24 4 15 7 34

2

5 3 5 7 1 5 2

17.15 —8.47 —1.53 17 -3-4 丄.-2+X—0.125 X 0.25 X 32 22.3 —2.45 — 5.3 — 4.55

6 4 6 9 5 11 9

=17.15- (8.47+1.53 ) =17 5 -4-3? = 7 亠

11

+5 X2 1 1

= 1 1 *32 =22.3-5.3- (2.45+4.55 ) 6 6 4 9 5 11 9 8 4

=17.15-10 =13-3 3 =91= 7*. ■5 +_5 X2 =1 =17-7=10

4 4 9 11 11 9

=7.15 = / 7 2 5 =5 (-+ -)X

9 9 11 11

,11 7 5 5 1 3 ( + - + ) X 72 4.25 —3——(2——1 12 18 24 6 6 4

=11 X 72 +—X 72+ —X 72 =4 1彳3

+ 1 --

5 1 (35+2丄)

12 18 24 4 4 6 6 =11*6+7*4+5*3 =6-6=0 =1887

7 1 1 187.7 X 11 —187.7 43 X -+57.125 X —0.5

8 2 2

=187.7* (11-1 ) =43 7 X - 1 1 1

+57丄X —-

8 2 8 2 2

=66+28+15 =109 1 7 1

—(43—+ 57—1 )

2 8 8

1

-*100=50

2

X &_3 ―1

4

3

-4

X g

卫*

14

弓)

3

49

：

* (f

-」）

15 7

49 *3=,7

15 7 5

3 1

2.42 - +4.58 X 1- —4-3

4 3

4 4 4

=2.42* +4.58 X - 一*1 =2

3 3 3

4

=4(2.42+4.58-1 ) =

3

=—*6=8

3 2十X 6.6+ 2.5 X

6*

7 12

118 —63 —13

4.6+3； +6；

+5.4

45 4 4 5

2.8+59+7.2+39G -石恸）

6 - + 2 -*6

5 2

1 3

2 *2*6

2 5

=10+10=20

1^ —(6三+1* ) =4- +32+63 +5- = (2.8+7.2 ) +54

+3- = 45 —2^ 第

8 3 3 5 5 5 5 9 9 55 12

圧—8=3 -= 4 3+5-+ ( 3- +63) =10+9=19 =2- 5 =1 7

88 5 5 5 5 1212

3

14

3

5-2后-1后

2 4

3 5 3

2 5

3 6 4

5

48 +2.25+5 8 +7

4

7

2 +47

+2

3

53

11

+16

石

=43+2丄+55+73

= 8 4

8 4

^2

3 5

75 +25 +4

7

=5311 11 +16寻

11 4 -164 =43+55 + 8 8

(2丄+73

) 4 4

=10+45

=70-—

4 167

=10+10=20

=14

5

=53

3

7

7

3 4 3

5 4 3 5

1 3

=2

3 +17 - 丐+

(35 +14)

= +— + —

4 8 4 +

—

4 +5=5-

3 1 +— +

+- ) =2 7 7

4 4

8 8

3

5 3 4 4 27 +3

i - 37 +19 +17

0.75+5 +； +0.375

5-

（霍+

请）

=5-4=1

5 +94 +99彳 +9994 +99994 9害 X 4.25+41 -

6 0.625 X 0.5+； +； X 62.5%

=(1+9+99+999+9999 ) 5 4 =11107

5 =48.3- (151

+45

)

=9

5

*41+41*1

3 =48 - 6 6

6

4 4 6

3 -20=28— =(9 5 + 1 1 1 ) *

4 - 10 10 6

6 4

17 85

=10* —

4 2

48.3-156 -4： 22 X 4 +25 X 75%-7 X 0.75

4

5 15 15

一 21 * _ I _ * *

兰

—

+ 8 2 8 2 8 5* / 1 1 八 = * (— +— +1)

8 2

2

=1

熄 +(24 -1.8)

4

4

4

=%+(巧-1 -)

4

4

4

15 - +2号=18 丄3

5 7 35

X 2.5-2

土

X 4

175

39 +3.125+1 g +17

1125-996

1 =2

*4* _9

=22 2 10

5亠9 9 =9 =*4* =10* =2

10 10 2.5X 遵 +19

+10 +知 10 10 10 10 丿 3

3

+25* -7*

(22+25+7)

3 = 71

4 2

1*631-1*13丄 =6

4 2 4 2

1 1 1

* (63 1

-13 1 )-

4 2 2

1 1

— *50=12 — =2*

4 2

0.25 X 63.5 - ~4 X 13

舟

7 117 8 1

1

7 2 -2 4

= 3 +1

+ (3-+1

) =1125- (1000-4)

15 2 2

15

9

9

8

8

7 7

1 (6 7 -4 7 ) *

2 1

=5+5=10 =1125-1000+4

15

15

2

-=5 =125+4=129

14 3

5-2后-1后

2

5

14 5

X 41i +51i

7

4 45X (9 +14 — 0?6)

6

(111+999) +[56X (3 -8 )]

=[110+ (1+999) ]/ (56 X 7 -56 X 8 7 8 =(110+1000)-( 24-21) 1 =1110* - 3

3 1

49.5X 105 -(50-2 )X 0.6 1 *

=49

2

1 =49 —

2 1 10

3 -491 X 5 2

(10 3--)

5 5 49

*10=495

2

=逻* (5--5 -) 4 8 8

=0 1 3.5 X 1~

4 1 1

7_ 11 7 11 7 11 7_

11

X 4需+5老 19 19 / 14 5

(怖+莎 *11=7 *7 11 +1) 897X 8 — 37.5%+104 X 0.375

8

7

+

11 =45* ( — +—--)

9 15 5

=45* - +45* — -45*

9 15

=35+12-27=20 3 3 3 897 X —- +104 X - 8 8 8 3

(897-1+104 )X - 8 =(896+104) 3

3 X - =1000X -=375

8

7 4 +1.25 X 2亦 +3.8 十 5 , , 1 7 4 5

=3 丄 *1 1+1 丄*2丄 +34

* - 2 4 4 10 5 4 c1 c 7 c4、* 5

=(3_+2 +3_ ) *-

2 10 5 4 7 c 7 19、* 5

=( +2 + ) * -

2 10 5 4 35 7 38、* 5

=( +2 + ) * - 10 10 10 4

72X 156-56X

72

=72* (156-56) =72*100 =7200

25X 32X 125 =25* (8*4) *125 =25*8* (4*125) =200*500=100000

563 X 999 71 X

99

3755+2996

8439+1001 446+295 888+999 709X 99+709 299X 101

=709 (99+1) =709*100 =70900

2100- 20

7

介

7 5 5

3 5、/ 5

8、/ 5

5

10 一 / 4

5、

2 - 2 . / 1 1、

4 3-— X + — X +

18X

+ 一 )

9 6 X 7+— X 5

----- ) X( 24 —

12 12 7 8 8 7

15 16 27

9

3 3

6 12

5 =3-(— + -)

=5

(3

+ 5

)

. 1* 1 ■ ------

+ 5 * 9 =18* 4 5

-+18*- =

2

=-* (7+5)

=

-1 *24-— *4

12 12

7

8 8

3 2 27 10

9

6

3 12 12 5

=3-1=2

=5

=

1*1 1 * +—

1 =2*4+3*5

= 2

2

*12 =2-

丄=1上

7

3 2

3 2

3

15

15

1 1

=_ +— 1 ~~

=8+15=23

=2*4=8

6 6 3

22x 6.6+2.5X

63 75.3X 99+75.3 13 13 =2丄*6 3+2-*6 - =75.3* (99+1)

2 5 2 5 1

3 3 =2 丄(6 3+6 3)

=75.3*100= 2 5 5 4.6X 3.7+54X 0.37 =4.6*3.7+5.4*3.7

=

(4.6+5.4 ) *3.7

=2丄

*12 6 2 5 =7530 =10*3.7 =37

0.125X 4+8 X &25+12.5%

&37-3.25-(1.37+1.75)

1 3 1 1 1

1

*2+2*82+2 =8.37-1.37- (3.25+1.75 )

8 4 8 4 8

1

( -+- +1)

=7-5=2

8 4 4 1 1 *2=-

8

4

5 * 6

6 “ =—* =33 2 5

7 1 ,2 19.82- 6.57— 3.43

4.6+3|+63+

5.4

48+2.25+58+72 5 5 8 8 4 9.63- 2.5- 4 6 - 0.25 一 7 /厂1 彳2、 3 /,1 口3、

=11— (

6—+1 —)

=15

- (4 — +5—) 8 3

=117-8 =3 -

8

=15

14

4

4

3 3

-10=5

14

14

=19.82- (6.57+3.43 ) 2

3 =4.6+5.4+ (3-+6-)

5 5

=43 +5- + (2- +73 )

8

8

4

4

=9.63/ (2.5*4 ) =6/

=19.82-10=9.82 =10+10=20 =10+10=20 =9.63/10=0.963

=6*4=24

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