【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.Thenlookattheheadingso

npage57andcheckyouranswers.Tasks•1Areancientnumbersthesame?•2Findthesmallestandthebiggestnumbers.•3Thefirstcalculatingmachines•4

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

anNumerals(埃及数字)AncientnumbersTask1:Areancientnumbersthesame?ChinaGreeceRomeEgyptindifferentways_____i

nthesamewayintenscountTask2:FindthesmallestandthebiggestnumbersWhoinventedanddeveloped1-9systemofnumbers?

Whyiszeroveryimportant?Itmadeiteasiertowritebignumbersandtocalculate.TheIndians1MrLi:May:MrLi:Everyoneknowsit.Kno

wswhat?The___language___of__numbers__.2MrLi:May:MrLi:Longago,peoplewrotetheminmanydifferentways.Wrotewhat?__________

_.3MrLi:May:MrLi:Peopleallcountinthisway.Inwhatway?___________..........AncientNumbersandNumberSystemMayisaskingMrLi,thew

riter,somequestionsabouthisarticleonnumbers.AncientNumbersandNumberSystem5MrLi:May:MrLi:Waszeroaveryimportantinvention

?___________.Why?__________________________________________________________________________.Yes,itwasBecausezeromadeiteasiertowr

itebignumbersandtocalculate.4MrLi:May:MrLi:Whoaddedonemorenumbertothesystem?___________.Whatnumberdidtheyinv

ent?___________.TheIndiansZeroAnaccurateancientcalculatingmachinethatisstillusedtoday.An____________.verycorrectTask3:

ThefirstcalculatingmachinesAsmallmachinethatuseselectronicpowertodocalculations.A____________.Othercalculating

machinessquarerootanelectroniccalculatorwatchdictionarypercentageAverypowerfulmachinefordoingcalculationsinaflash.A____________.withgreatpowerve

ryquicklyOthercalculatingmachinesaddsubtractmultiplydividedosomecalculations1x9+2=12x9+3=123x9+4=1234x9+5=11111111111111Mr.Li:Whichcalculatingm

achinedoyoulikebest?S1:Ilike________best,because______.Howaboutyou,Mr.Li?Mr.Li:______ismyfavouritebecause

______.CalculatingmachinesAstoryaboutcomputersandhumanbrainWhoWhatHowlongTheresultAnIndianlady&computersTheywere

giventhisproblemtosolve.50secondsaminuteWhatiscalledalivingcomputer?likelightningShakuntalaDeviMr.Liisworking

hardonthereportoftheamazinggirl,ShakuntalaDavi.Pleasehelphimout.BrainagainstComputer_____ismorepowerfulThinking:AdvantagesT

heAdvantagesoftheBRAINTheAdvantagesoftheCOMPUTERNop_____________neededNoe_____________neededBetteratimaginati

onBetteratunderstandingtheouterworldandcomingupnewideasMorec___________SmallerandsmallerS______moretimeBetteratdoing

manydifficulttasksatthesametimerogramminglectricityonvenientavingAconversationbetweenancientpeopleandmodernpeopleMakeaconversationamongfour

studentsaboutnumbers.S1:Wecomefromancienttime.Whatdoyouusetodocalculations?S2:Wecomefrommoderntime.Arenumbersinve

ntedbyyou?……Number•N--•U--•M--•B--•E--•R--NumerousUsefulMeaningfulBeautifulEffectiveRegularHomeworkWriteacomposition______ismorepowerful.