七年级英语The world of numbers课件2.ppt

,TheworldofNumbers,CountNumber(编号)TellyouthetimeUseinMaths,Aninternationallanguage,HowmuchdoyouknowaboutNumbers?,Decimals小数,Evennumbers偶数,Oddnumbers奇数,Fractions分数,Anumbershowingdegrees度数,Apercentage百分数,Whatkindsofnumbersarethey?,2461351.350.7,3/42/5256220%60%,Wecanusethemtocalculate.,anelectroniccalculator,acomputer,anabacus,Calculatingmachines,anelectroniccalculator,add,subtract,multiply,divide,percentage,squareroot,calculate,CalculatingMachine,CalculatingMachine,beads,wires,5,724,thousands,hundreds,tens,ones,anabacus,AWhatdoyouknowabout?,1adecimalnumbers2apairofoddnumbers3afraction4zero5add;plus6subtract;minus7mutiply;times8divide9anumbershowingdegrees10apercentage11apairofevennumbers12equals,A+B0C5/8DE=F1345G8210H90IJ0.82K45%L,AWhatdoyouknowabout?,1adecimalnumbers2apairofoddnumbers3afraction4zero5add;plus6subtract;minus7mutiply;times8divide9anumbershowingdegrees10apercentage11apairofevennumbers12equals,A+B0C5/8DE=F1345G8210H90IJ0.82K45%L,J0.82,F1345,C5/8,B0,A+,L-,Ix,D,H90,K45%,G8210,E=,Reading(1),Writedown-Title:_Headings:_Guess-Thetextisaboutthe_ofnumbersandthedescriptions(描述)ofthree_.,Lookatthetitle,theheadingsandthepictures,andthen,Ancientnumbers,Zero,Calculatingmachines,Numbers:Everyoneslanguage,history,calculatingmachines,Readthetextagainandanswerthequestions,1,2,3,4,Whatcananelectroniccalculatordo?,Itcanadd,subtract,multiplyanddivide.Itcanalsocalculatepercentagesandsquareroots.,Howdidpeopleinancienttimescountinthesameway?,Theynearlyall_.,countedintens,Howlongcanacomputerdoacalculation?,Inaflash.,Whatdothebeadsonthewiresstandfor?,Theystandfor_,ones,tens,hundreds,thousands.,Summary,Everyoneknowsatleasttwolanguages-hisownlanguageandthe_languageofnumbers.In_times,nearlyallnumberswerecountedintens.The_firstinventedand_thesystemofnumberstoday.It_ofthenumbersfrom1to9and0.Anabacusisfastandaccurate.Itwasoneofthefirst_machines.Modernelectroniccalculatorscan_,subtract,multiplyanddivide.Computersarevery_calculatingmachines.Theycandocalculationina_.,Answers:,internationalancientIndiansdevelopedconsistscalculatingaddpowerfulflash,DFindthefacts,MayasksTMLi,thewriter,somequestionsabouthisarticleonnumbers.Hisanswersarenotalwaysclear.ReadthearticleandmakeLisanswersclearer.Writeonewordineachblank.,1Everyoneknowsit.Knowswhat?TheLanguageofnumbers.,2Longago,peoplewrotetheminmanydifferentways.Wrotewhat?Numbers.3.Peopleallcountinthisway.Inwhatway?Intens.4.TheIndiansinventedthatsystemofnumbers.Whichsystemofnumbers?The1to9system.,5Theinventionhelpedpeoplewriteinbignumbers.Whatinvention?Theinventionofthezero.6Theyarefastandaccurate.What?Abacuses.7Computersareverypowerfulones.Verypowerfulwhat?Calculatingmachines.,Homework,1.听录音,跟读课文3遍,家长签名,并在课文中找到以下词组:至少帮助某人做某事在古代代表;表示由组成写下以很多种方式一瞬间;很快2.抄写新单词3.完成课本P46的C部分.,Reading(2),plus,minus,multiply,divide,Reviewthewords,1plus3isfour,Calculate,1+3=4,5minus2isthree,5-2=3,3multipliedby9is27,39=27,9dividedby3is3.,93=3,Languagepoints,Readthetexttogether!,1.atleast至少=notlessthan,Weshouldreciteatleast10Englishwordseveryday.,反义词:atmost至多,Theconcerthallcanholdatmost1,000people.,2.inancienttimes在古代,=longlongago,=onceuponatime,Inancienttimes,peopleusedstonesasmoney.,ancient反义词:modern现代的,times=agen.时代,3.consistof由组成,=include=bemadeupof,Ourclassconsistsof25girlsand30boys.,4.inmanydifferentways以很多种方式,Wekeepfitinmanydifferentways.,5.helpsb(to)dosth.=helpsb.withsth.,Ilikehelpingmymotherdothehousework.,=Ilikehelpingmymotherwiththehousework.,6.standfor=represent代表;表示,PRCstandsforPeoplesRepublicofChina.,8.inaflash=veryquickly=inaveryshorttime一瞬间;很快,Acomputercandoacalculationinaflash.,7.writedown写下请写下你的名字。,Writedownyourname,please!,电脑可以在一瞬间完成计算.,1.atleast至少,2.inancienttimes在古代,3.consistof由组成,4.inmanydifferentways以很多种方式,5.helpsb(to)dosth.帮助某人做某事,6.standfor=represent代表;表示,7.writedown写下,8.inaflash=veryquickly一瞬间;很快,Reviewtheimportantphrases:,1ancient:manymanyyearsago(a)2consistsof:includes(b)3invented:madeforthefirsttime(b)4accurate:withoutmistakes(a)5percentages:amountsoutofahundred(a),C1Findthesewordsinthearticleonpage45.Readthewordsaroundthemandchoosethebestmeanings.,AB1internationalagrewbiggerorstronger2systembagroupofthingsworkingtogether3developedccountwithnumbers4calculatedstrong5bottomeusedbymorethanonecountryornation6powerfulfinthelowestplace,C2FindthewordsinColumnAinthearticleandmatchthemwiththemeaningsinColumnB.,1Acalculatingmachineusingwiresandheads.An_2Asmallmachineusingelectronicpowertodocalculations.A_3Averypowerfulmachinefordoingcalculations.A_,C3Whatdothefollowingdescriptionsreferto?Writedownthecorrectnamesintheblanks.,calculator,computer,abacus,Listening,Nowtryaquizaboutnumbers.Listentotheinstructionsontherecording,andcircletherightanswer.,8049172.6626%2/6$7575%75o1/80.753356656690o90%1/9,725653881256628812565288181.8%80%18%9$5,000$50,000$50,000,0001030.5o13.5o35o,1Whichoneoftheseisanevennumber?2Whichoneoftheseisafraction?3Whichoneoftheseisapercentage?4Whichoneoftheseisadecimalnumber?5Whichoneoftheseisanoddnumber?,Tapescript,6Whichoneoftheseisanumbershowingdegrees?7Myphonenumberis25652881.818percentofmyclassmatescometoschoolonfoot.9Thisringcostsfiftythousanddollars.10Thehighesttemperaturetodaywas30point5degrees.,Tapescript,Grammar,Cardinalnumbers基数,Ordinalnumbers序数,Decimals小数,Evennumbers偶数,Oddnumbers奇数,Fractions分数,anumbershowingdegrees度数,percentage百分数,Cardinalnumbers（基数词,表总数,点钟,电话号）,37,890,542,thousand,million百万,Howtoread23,150,305?,thirty-sevenmillion,eighthundredandninetythousandfivehundredandforty-two,365,threehundredandsixtyfive,69,743,thousand,sixtyninethousand,sevenhundredandfortythree,Ordinalnumbers(表次序的数词叫序数词,由基数词变化而来),1:one-(the)first第一2:two-()second3:three-()third4:其余序数词由基数词后加-th变化而来。fourth,sixth,.,five-thefifthtwelve-thetwelftheight-theeighthnine-theninth,几个特殊变化的序数词,Competition,Sep.10SeptemberthetenthOct.1OctoberthefirstDec.24Decemberthetwenty-fourth,TeachersDayNationalDayChristmasEve,读日期和写日期有什么区别吗？,226centimetres,HowtallisYao?,2.26metres,point,Decimals（小数）,6.14,Everest珠穆朗玛峰,sixpointonefour,8,844.43m,Howmuchisit?,￥2.90,Howmucharethecrisps?,1.50,(twopointnineyuan),(onepointfivedollars),Evennumbers,142022,84636,122,Oddnumbers,9153393,48742,901,thenumbersofyears表示年份的数词,HongKongreturnedinChinain_.,1997,In_theOlympicGameswi