【文档说明】《Unit 4 Numbers》优质课件1-八年级上册英语【牛津上海版】.ppt，共(26)页，7.533 MB，由小喜鸽上传

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NumbersPleasetellusoneofyourfavoritenumberandexplainthereason.ReviewandquestionsBrainstormingWhenandwherewemayusenumbers?Beforeyoureadthepassage,

lookatthefollowingpicturesfirst.Putthemintheorderofthehistoryofnumbers.Thenlookattheheadingsonpage57andcheckyou

ranswers.Tasks•1Areancientnumbersthesame?•2Findthesmallestandthebiggestnumbers.•3Thefirstcalculatingmachines•4Whatiscalled

alivingcomputer?AncientnumbersGreekNumerals(希腊数字)RomanNumerals(罗马数字)AncientnumbersChineseNumerals(中国数

字)AncientnumbersEgyptianNumerals(埃及数字)AncientnumbersTask1:Areancientnumbersthesame?ChinaGreeceRomeEgyptindifferentways_____i

nthesamewayintenscountTask2:FindthesmallestandthebiggestnumbersWhoinventedanddeveloped1-9systemofnumbers?Whyiszeroveryimportant?Itmadeitea

siertowritebignumbersandtocalculate.TheIndians1MrLi:May:MrLi:Everyoneknowsit.Knowswhat?The___language___of__numbers__.2MrLi:May:M

rLi:Longago,peoplewrotetheminmanydifferentways.Wrotewhat?___________.3MrLi:May:MrLi:Peopleallcountinthisway.Inwhatway?

___________..........AncientNumbersandNumberSystemMayisaskingMrLi,thewriter,somequestionsabouthisarticleonnumbers.AncientNumbersandNumbe

rSystem5MrLi:May:MrLi:Waszeroaveryimportantinvention?___________.Why?________________________________________________________________________

__.Yes,itwasBecausezeromadeiteasiertowritebignumbersandtocalculate.4MrLi:May:MrLi:Whoaddedonemorenumbertothesystem?___________.What

numberdidtheyinvent?___________.TheIndiansZeroAnaccurateancientcalculatingmachinethatisstillusedtoday.An____________.verycorrectTask3:Thefirst

calculatingmachinesAsmallmachinethatuseselectronicpowertodocalculations.A____________.Othercalculatingmachines

squarerootanelectroniccalculatorwatchdictionarypercentageAverypowerfulmachinefordoingcalculationsinaflash.A____________.w

ithgreatpowerveryquicklyOthercalculatingmachinesaddsubtractmultiplydividedosomecalculations1x9+2=12x9+3=123x9+4=1234x9+5=111

11111111111Mr.Li:Whichcalculatingmachinedoyoulikebest?S1:Ilike________best,because______.Howaboutyou,Mr.Li?Mr.Li:______ismyfavour

itebecause______.CalculatingmachinesAstoryaboutcomputersandhumanbrainWhoWhatHowlongTheresultAnIndianlady&computersTheywere

giventhisproblemtosolve.50secondsaminuteWhatiscalledalivingcomputer?likelightningShakuntalaDeviMr.Liisworkinghardonthe

reportoftheamazinggirl,ShakuntalaDavi.Pleasehelphimout.BrainagainstComputer_____ismorepowerfulThinking:AdvantagesTheAdvantagesoftheBRAINTheAdvantages

oftheCOMPUTERNop_____________neededNoe_____________neededBetteratimaginationBetteratunderstandingtheou

terworldandcomingupnewideasMorec___________SmallerandsmallerS______moretimeBetteratdoingmanydifficulttasksatthesametimerogramminglectricityonvenient

avingAconversationbetweenancientpeopleandmodernpeopleMakeaconversationamongfourstudentsaboutnumbers.S1:Wecomefromancienttime.Whatdoyo

uusetodocalculations?S2:Wecomefrommoderntime.Arenumbersinventedbyyou?……Number•N--•U--•M--•B--•E--•R--NumerousUsefulMeaningfulBeautifulEffe

ctiveRegularHomeworkWriteacomposition______ismorepowerful.