【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.Thenlookattheheadingsonpage57andcheckyouranswers.Task

s•1Areancientnumbersthesame?•2Findthesmallestandthebiggestnumbers.•3Thefirstcalculatingmachines•4Whatiscalledalivingcomputer?AncientnumbersGreekNume

rals(希腊数字)RomanNumerals(罗马数字)AncientnumbersChineseNumerals(中国数字)AncientnumbersEgyptianNumerals(埃及数字)AncientnumbersT

ask1:Areancientnumbersthesame?ChinaGreeceRomeEgyptindifferentways_____inthesamewayintenscountTask2:FindthesmallestandthebiggestnumbersWhoinvent

edanddeveloped1-9systemofnumbers?Whyiszeroveryimportant?Itmadeiteasiertowritebignumbersandtocalculate.TheIndians1MrLi:May:MrLi:Everyoneknows

it.Knowswhat?The___language___of__numbers__.2MrLi:May:MrLi:Longago,peoplewrotetheminmanydifferentways.Wrotewhat?___________.3MrLi:May:MrLi

:Peopleallcountinthisway.Inwhatway?___________..........AncientNumbersandNumberSystemMayisaskingMrLi,thewriter,somequestionsabo

uthisarticleonnumbers.AncientNumbersandNumberSystem5MrLi:May:MrLi:Waszeroaveryimportantinvention?____

_______.Why?__________________________________________________________________________.Yes,itwasBecausezeroma

deiteasiertowritebignumbersandtocalculate.4MrLi:May:MrLi:Whoaddedonemorenumbertothesystem?___________.Wh

atnumberdidtheyinvent?___________.TheIndiansZeroAnaccurateancientcalculatingmachinethatisstillusedtoday.An____________.

verycorrectTask3:ThefirstcalculatingmachinesAsmallmachinethatuseselectronicpowertodocalculations.A______

______.OthercalculatingmachinessquarerootanelectroniccalculatorwatchdictionarypercentageAverypowerfulmac

hinefordoingcalculationsinaflash.A____________.withgreatpowerveryquicklyOthercalculatingmachinesaddsubtractmultiplydividedosomeca

lculations1x9+2=12x9+3=123x9+4=1234x9+5=11111111111111Mr.Li:Whichcalculatingmachinedoyoulikebest?S1:Ilike________best,becaus

e______.Howaboutyou,Mr.Li?Mr.Li:______ismyfavouritebecause______.CalculatingmachinesAstoryaboutcomputersandhumanbrainWhoWha

tHowlongTheresultAnIndianlady&computersTheyweregiventhisproblemtosolve.50secondsaminuteWhatiscalledalivingcomputer?likelightningShakuntalaDeviMr.L

iisworkinghardonthereportoftheamazinggirl,ShakuntalaDavi.Pleasehelphimout.BrainagainstComputer_____ismorepowerfulThinking:Advant

agesTheAdvantagesoftheBRAINTheAdvantagesoftheCOMPUTERNop_____________neededNoe_____________neededBetteratimaginationBetteratunderstandi

ngtheouterworldandcomingupnewideasMorec___________SmallerandsmallerS______moretimeBetteratdoingmanydifficulttasksatthesametimerogramminglectric

ityonvenientavingAconversationbetweenancientpeopleandmodernpeopleMakeaconversationamongfourstudentsaboutnumbers.S1:Wecomefr

omancienttime.Whatdoyouusetodocalculations?S2:Wecomefrommoderntime.Arenumbersinventedbyyou?……Number•N--•U

--•M--•B--•E--•R--NumerousUsefulMeaningfulBeautifulEffectiveRegularHomeworkWriteacomposition______ismorepowerful.