四年級(jí)下冊(cè)簡(jiǎn)便運(yùn)算集錦

1、四年級(jí)下冊(cè)第三單元簡(jiǎn)便運(yùn)算舉例、練習(xí)第一種(例)25x(4+8)125x(8+8)(11+25)x8=25x4+15x8=100+120=220第二種（例）84x101504x2578x10225x204=84x(100+1)=84x100+84x1=8400+84=8484第三種（例）99x6499x16638x99999x99=(100-1)x64=100x64-1x64=6400-64=6336第四種（例）99X13+1325+199X2532X16+14X3278X4+78X3+78X3(99+1)x13=100x13=1300第五種（例）25X32X125125X32X888X125

2、72X125=(25X4)X(8X125)=100X1000=1000001250+25+5第六種(例)3600+25+48100+4+753000+125+8=3600+25X4)=3600T00=36第七種1200-624-762100-728-772273-73-27847-527-273=1200-(624+76)=1200-700=500第八種278+463+22+37732+580+268425+14+186=(278+22)+(463+37)=300+500=800(155+230)第九種214-(86+14)787-(87-29)365-(65+118)455-=214-14-

3、86=200-86=114第十種871-299157-99363-199968-599=871-300+1=571+1=572第H一種178X101-17883X102-83X217X23-23X735X127-35X16-11X35(101-1)X178=100X178=17800第十二種64+8X2)=64為e=8及=4第十三種625及5=62555=1255=251300413X5)480360及427048X2)M5第十四種100+45-100+4525+75-25+75423+76-76+77243+85-243+85(100-100)+(45+45)=0+90=90第十五種20X4

4、+20X425X4+25X456X8+56X812X612X6(2020)X(4X4)=1X16=16練習(xí)：169+354+231+146987-362-1381347-(347+125)135+236-135+236198X26148X56-48X56210T5199X37+37215X63-15X63101X22-22203X14125X33X4125X16X50365+997452-398簡(jiǎn)便運(yùn)算習(xí)題1 .加法交換律(a+b=b+a如：152+389+348=152+348+399=500+399=899習(xí)題：77+56+23165+477+135154+288+462 .加法結(jié)合律a+

5、b+c=a+(b+c)如：591+482+118=591+(482+118)=591+600=1191習(xí)題：285+147+25399+178+122456+588+412692+325+753 .加法交換律、結(jié)合律如：32+29+68+41=32+68+29+41加法交換律(32+68)+(29+41)加法結(jié)合律=100+70=170習(xí)題：(148+64)+(52+136)650+(171+350)+129128+114+86+1724 .乘法交換律a>b=b柏如：25>45>4=25MM5=100>45=4500>69>2525M1M125>27&

6、gt;840如：78M25M125>32=78義Q25M)=125x8>4)=78M000=125>8M=78000=4000習(xí)題：52>25>4125M25.乘法結(jié)合律：a>b>c=aX(b>C)125>8825>3225>44125>486.乘法交換律、結(jié)合律如：125M>8>25=125>8>4>25乘法交換律=(125>8)X4>25)乘法結(jié)合律=1000X00=100000>101-27習(xí)題：125>25>32如：27>57+27>4327&

7、gt;99+2727>99=27義57+43)=27X99+1)=27XQ00-1)=27M00=27M00=27M00-27M=2700=2700=26737.乘法分配律：a>(b+c)=a>b+a>c習(xí)題：67>34+67>66127>43-27>432727M0167>21+67X78+6767>23+67>78+67-6712刈40+66M2025>44125>8885>10269M0278>9865+65>995M7+87+87M8 .減法運(yùn)算性質(zhì)；a-b-c=a-(b+c)=a-c-b如

8、：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習(xí)題：456-273-127623-169-223553-(289+153)772-456+228689-(289-153)136-88+164-1129 .除法運(yùn)算性質(zhì);a書c=ab>C)=a化也如：720+36+2=720+(36>2)=720+72=10習(xí)題：2700及5M5600e5H563900+39M)綜合練習(xí)簡(jiǎn)便運(yùn)算怎樣簡(jiǎn)便就怎樣算。一、355+260

9、+140+24598X10148X125645-180-24538X99書83500+14+5175X56+25X5650X25X20X40、368+156+344+132125X47X87200+25444X2596X58+96X426300+(63X5)482-(182+50)135X27+135X72+135、368+156+344+132125X47X87200+25+444X2596X58+96X426300+(63X5)482-(182+50)135X27+13572+135四、789-136-64132X29+13298X83+1663700+4+2588X125048X1251

10、25X32X12536X88+36X-508五、355+260+140+24598X10148X125645-180-24538X99書83500+14+5175X56+25X56125X32X25六、98+265+202273-73-27250X13X43200+4+2588X12599X38+3817X2323X772X125七、64X155X6425X(12X40)99X56+562182-1655-3453200+4+25298X99寂98(40+8)X2597X8X125八、355+260+140+245102>992M25645-180-245382X01-3824>6

11、0>50>835>8+35>6-4>35125刈2九、25M6101>5699>261022-478-422987(287+135)478-256-14467236+6436+64-36+64十、48728713961500-257-34-1432000-368-1321814-378-42289>99+89155+264+36+4425X20+4)88>225+225X2、698-291-9568(68+178)56119+58382+165+35-82236+189+64759-126-25925X79X4569-256-44216+8

12、9+1157X125X81050+15+7169X12323X16937X99+37129X101T29149X69149+149X3256X51+56X48+56十三、125X25X3224X25125X48514+189214369256+156(291176)56X25X4X12524X73+26X24109+十四、16X98+32512+(373212)228+(72+189)169+199586>9957525027537>2121X221125>88>25、計(jì)算（能簡(jiǎn)便就簡(jiǎn)便）539-513+(378+14)、85+14X(14+208+26)21+(327

13、-23)+1934-3094+17-1319+(253-22)+2150+20X2842(23+23)X24597(110-10)+101045-24+14X14、304-275+(275+25)(70+10)+(1810)120+12X-5444+16X1532(10-100+10)X11(53-588-21)X36(60+10)+(1710)17+(233-43)+10100-10X-60、424-475+19X1622+(374-10)+26(245-11)+181113+10X1522-(10+100+10)(252-14)+171035-(346-10)+1612215-198+(1

14、21+11)(45-651+21)X33四、19+192+1210572-22X235819+56-1224-3418-(13+15)+262(714-12)+271914+(21-19)X14736+(4320)X23(227+11)+(3114)36+19X1423五、828+23X-4818-15+10X18(31-154+11)X12(1369-37)+3732160+(2212)X22357+21X-313985-728+26X35(438-39)+2-12(20+18)X1-239六、50+160+4068+370)+64-45)120-144+18+3578X501440+123

15、856+16+85X164000+(16+832+13)(427524X75)+25七、178-145+5X6+42420+580-64X21-28812-700+(9+31X11)50+160+40=54120-144+18+35=147(58+37)+64-9X5)95-64-45)178-145+5X6+42120-36X4+18+35(326+95X25)+37(7236-18-228)X28136M01-136八、58>58+58M23874(874+1000)329-38-6234725325X25M2360九、44>25591+482

16、+11899X26125M5>8986+1999473+79-6380>501-8076+38+24+162199>99+199十、25X25>4>840>9>25>855>25+25>4532+129+268+71438+126+162+67455>55+45>5518>27+18>2358M37-58刈778>8-28>88>6X25>58>135+8>6556刈7-56>26-56、45>12+55X1242>9+58>955M5+45M57>69+7>2136>27+27>6499>64+64十二、250>3648>250202>45125>32199X50301>3045>201-4549>49+4925義6+40)十三、8>6X1257>4>2509>59+9>31899M99+9935M3X12599>401-3539>99+99M01-39十四、25>32X