四年级下册简便运算集锦Word文件下载.docx
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四年级下册简便运算集锦Word文件下载.docx
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第十二种64÷
(8X2)1300÷
(13X5)480÷
(8X2)
=64÷
8÷
2
=8÷
=4
第十三种625÷
25360÷
24270÷
45
55÷
=625÷
5=125÷
=25
243+85-243+85423+76-76+7725+75-25+75第十四种100+45-100+45
=(100-100)+)(45+45=0+90
=90
12X6÷
12X656X8÷
56X8第十五种20X4÷
20X425X4÷
25X4
)20X(4X4)=(20÷
=1X16
=16
347+125)练习:
169+354+231+1461347-(987-362-138
148X56-48X56198X26135+236-135+236
210÷
15215X63-15X63199X37+37
125X33X4101X22-22203X14
125X16X50365+997452-398
/2
简便运算习题
1.加法交换律(a+b=b+a)
如:
152+389+348
=152+348+399
=500+399
=899
习题:
77+56+23165+477+135154+288+46
2.加法结合律a+b+c=a+(b+c)
591+482+118
=591+(482+118)
=591+600
=1191
285+147+25399+178+122456+588+412692+325+75
3.加法交换律、结合律41
+29+68+如:
32=32+68+29+41加法交换律
29+41加法结合律)=(32+68)+(=100+70
=170
128+114+86+172650+(171+350)+129+习题:
(148+64)(52+136)
a×
×
b=b4.乘法交换律a445如:
25×
×
=25×
445
45=100×
=4500
6940×
254125×
27×
8×
2531×
c)
b×
c=a×
(b×
5.乘法结合律:
a32
125×
如:
78×
125×
8
8)=125×
(8×
4)125=78×
(48×
=125×
=78×
1000
=4000
=78000
7212542552习题:
88×
125
/3
25×
3225×
44125×
48
6.乘法交换律、结合律
4×
8×
25
=125×
25乘法交换律
=(125×
8)×
(4×
25)乘法结合律
=1000×
100
32
7.乘法分配律:
a×
(b+c)=a×
b+a×
c
57+27×
4327×
99+2727×
99
=27×
(57+43)=27×
(99+1)=27×
(100-1)
100=27×
100-27×
1
=2700=2700=2673
67×
34+67×
66127×
43-27×
101-27
27×
10167×
21+67×
78+6767×
23+67×
78+67-67
12×
340+66×
12025×
44125×
88
85×
10269×
10278×
98
65+65×
995×
87+87+87×
8.减法运算性质;
a-b-c=a-(b+c)=a-c-b
781-178-122721-488-121745-(245+188)
=781-(178+122)=721-121-488=745-245-188
=781-300=600-488=500-188
=481=112=312
456-273-127623-169-223553-(289+153)
/4
772-456+228689-(289-153)136-88+164-112
9.除法运算性质;
a÷
b÷
c=a÷
c)=a÷
c÷
b
720÷
36÷
2
=720÷
(36×
2)
=720÷
72
=10
2700÷
45600÷
563900÷
(39×
4)
/5
综合练习简便运算
怎样简便就怎样算。
一、355+260+140+24598×
10148×
125645-180-245
38×
99+383500÷
14÷
5175×
56+25×
5650×
20×
40
二、368+156+344+132125×
47×
87200÷
444×
27+135×
72+135135×
)(182+504296×
58+96×
6300÷
(63×
5)482-
47200÷
2544×
三、368+156+344+132125×
)(58+96×
96×
426300÷
63×
5)482-(182+50135×
27+135×
72+135
2583+1663700÷
4÷
98×
132×
789-136-64四、29+132
12532×
12548×
88×
1250125×
15-10836×
88+36×
/6
五、355+260+140+24598×
99+383500÷
56125×
32×
六、98+265+202273-73-27250×
13×
43200÷
88×
12599×
38+3817×
23-23×
772×
345-2182-165525×
(12×
40)99×
56+56七、64×
15-5×
64
2597×
125993200÷
25298×
+298(40+8)×
645-180-245102×
992×
125八、355+260+140+245
6-435125×
32×
504382×
101-382×
60×
8358+35×
-2699×
-102247842256101×
九、2546×
135287987-(+)64+3664+36672-256-478144--64+36
/7
十、487-287-139-61500-257-34-1432000-368-1321814-378-422
89×
99+89155+264+36+4425×
(20+4)88×
225+225×
12
十一、698-291-9568-(68+178)561-19+58382+165+35-82
236+189+64759-126-25925×
79×
4569-256-44
十二、
123—23×
16915÷
1050÷
7216+89+11169×
57×
48+56—149×
69149+149×
3251+56×
56×
101129×
99+3737×
—129
24×
25514+189—21432125×
十三、25×
176291109+73+26×
12525×
56×
24(——369256+156)
(228+)212—(512+98+3216×
十四、373169+199)72+189
/8
586×
99575—250—27537×
21—21×
12—21125×
三、计算(能简便就简便)
一、85+14×
(14+208÷
26)21+(327-23)÷
19539-513÷
(378÷
14)
34-3094÷
17÷
1319+(253-22)÷
2150+20×
28-42
45-24+14×
(110-10)÷
(23+23)×
24-59710-1014
120÷
(70+10)÷
二、304-275÷
(275÷
25)(18-10)12×
18-54
36(53-588÷
21)×
44+16×
15-3211(10-100÷
10)×
10×
10-60(17-10)(60+10)÷
17+(233-43)÷
10100÷
18-11(245-11)÷
22+(374-10)÷
16424-475÷
三、19×
26
10)22-(10+100÷
17-10(252-14)÷
1535-13+10×
/9
(346-10)÷
16-12215-198÷
(121÷
11)(45-651÷
33
四、19+192÷
12-10572÷
22×
23-15819+56-1224÷
34
(714-12)÷
27-1914+(21-19)×
1418-(13+15)÷
262
736÷
(43-20)×
23(227+11)÷
(31-14)36+19×
14-23
11)×
12五、828÷
23×
12-48(31-154÷
1818-15+10×
357÷
21×
13-213(1369-37)÷
37-32160÷
(22-12)×
22
(20+18)×
11-23935985-728÷
26×
(438-39)÷
21-12
120-144÷
18+3540+六、50160÷
64-4558+370()÷
()
)1316+832÷
4000÷
163856÷
16+85×
121440÷
-78×
50(
(7236÷
37÷
)326+95×
(25187524×
4275(28)228-×
-25÷
)
/10
七、178-145÷
5×
6+42420+580-64×
21÷
28812-700÷
(9+31×
11)
50+160÷
40=54120-144÷
18+35=147(58+37)÷
(64-9×
5)
95÷
(64-45)178-145÷
6+42120-36×
18+35
八、58×
58+58×
423874-(874+1000)136×
101-136
425÷
-1474600÷
329-38-62347-129
÷
45×
825125×
323606000
I269948244九、×
25591++118
473+79-638125×
15×
986+1999
19999+19976+38+24+162501-8080×
8×
259×
408×
十、254×
45×
25+25×
55
/11
32+129+268+71438+126+162+67455×
55+45×
6×
58×
135+8×
6556×
37-56×
26-56
十一、45×
12+55×
1242×
9+58×
955×
45+45×
18×
27+18×
2358×
137-58×
3778×
8-28×
27+27×
64×
64+64997×
69+7×
2136×
202×
3648×
250十二、250
301×
30×
3219950
4945×
201-45×
49+49×
(258+40)
25025047×
十三、86125×
4×
3
125×
13831×
959+9×
99+99
9913
/12
99×
199+9935×
401-3539×
101-39
十四、25×
12515×
(4+16÷
4)165-35-65
94+38+106+62125×
825×
8125×
48989-186-14
21×
373732×
+47×
37+136×
十五、4600÷
4101-136
78×
37-37×
6899×
77+7799×
(12599+125)×
169+3+9999+5+99×
7+7+3×
5
99102十六、355+260+140+245×
645-180-245
50×
4101-382×
38260835
6-4×
8+35×
35
/13
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