【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.ReviewandquestionsBrainstormingWhenandwherewem

ayusenumbers?Beforeyoureadthepassage,lookatthefollowingpicturesfirst.Putthemintheorderofthehistoryofnumbers.Thenlookatthe

headingsonpage57andcheckyouranswers.Tasks•1Areancientnumbersthesame?•2Findthesmallestandthebiggestnumbers.•3Thefirst

calculatingmachines•4Whatiscalledalivingcomputer?AncientnumbersGreekNumerals(希腊数字)RomanNumerals(罗马数字)AncientnumbersChineseNumerals(中国数字)Ancientnu

mbersEgyptianNumerals(埃及数字)AncientnumbersTask1:Areancientnumbersthesame?ChinaGreeceRomeEgyptindifferentways_____inthesamewayintenscoun

tTask2:FindthesmallestandthebiggestnumbersWhoinventedanddeveloped1-9systemofnumbers?Whyiszeroveryimportant?Itmadeiteas

iertowritebignumbersandtocalculate.TheIndians1MrLi:May:MrLi:Everyoneknowsit.Knowswhat?The___language___of__numbers__.2MrLi:May:MrLi:L

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

..........AncientNumbersandNumberSystemMayisaskingMrLi,thewriter,somequestionsabouthisarticleonnumbers.AncientNumbersandNumberSystem5MrLi:May

:MrLi:Waszeroaveryimportantinvention?___________.Why?__________________________________________________________________________.Yes,itwasBecausezerom

adeiteasiertowritebignumbersandtocalculate.4MrLi:May:MrLi:Whoaddedonemorenumbertothesystem?___________.Whatnumberdidt

heyinvent?___________.TheIndiansZeroAnaccurateancientcalculatingmachinethatisstillusedtoday.An____________.veryco

rrectTask3:ThefirstcalculatingmachinesAsmallmachinethatuseselectronicpowertodocalculations.A____________.Otherc

alculatingmachinessquarerootanelectroniccalculatorwatchdictionarypercentageAverypowerfulmachinefordoingcalculationsinaflash.A__

__________.withgreatpowerveryquicklyOthercalculatingmachinesaddsubtractmultiplydividedosomecalculations1x9+2=12x9+3=123x9+4=1234

x9+5=11111111111111Mr.Li:Whichcalculatingmachinedoyoulikebest?S1:Ilike________best,because______.Howaboutyou,Mr.Li?Mr.Li:______ismyfavou

ritebecause______.CalculatingmachinesAstoryaboutcomputersandhumanbrainWhoWhatHowlongTheresultAnIndianlady&computersTheyweregiv

enthisproblemtosolve.50secondsaminuteWhatiscalledalivingcomputer?likelightningShakuntalaDeviMr.Liisworkinghardonthereportoftheamazinggirl,Shaku

ntalaDavi.Pleasehelphimout.BrainagainstComputer_____ismorepowerfulThinking:AdvantagesTheAdvantagesoftheBRAINTheAdvantagesoft

heCOMPUTERNop_____________neededNoe_____________neededBetteratimaginationBetteratunderstandingtheouterworldandcomingupn

ewideasMorec___________SmallerandsmallerS______moretimeBetteratdoingmanydifficulttasksatthesametimerogramminglectricityo

nvenientavingAconversationbetweenancientpeopleandmodernpeopleMakeaconversationamongfourstudentsaboutnumbers.S1:Wecomefromancienttime.Wha

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

lEffectiveRegularHomeworkWriteacomposition______ismorepowerful.