七年级英语上：CHAPTER FOUR The world of numbers课件深圳牛津版.ppt

chapter4theworldofnumbers contents readinglisteninglanguagespeakingwriting reading awhatdoyouknowabout weallusenumbersinourdailylife numbersareaninternationallanguage whatdoyouknowaboutthelanguageofnumbers learnthefollowing adecimalnumberiswrittenasadot eg 0 65 zeropointsixfive sixty five 8 08 eightpointoeight readthefollowing 7 53 3 42 0 01 86 20 1adecimalnumber 小数 oddnumberscannotbedividedbytwotogiveawholenumberwithoutafraction 2oddnumbers 奇数 3evennumbers 奇数 evennumberscanbedividedbytwotogiveawholenumber afractionistheexactdivisionofanumber eg onehalf2 3 twothirds aquarter1 10onetenthreadthefollowing 3 5 6 11 1 8 4afraction 分数 5plus add 加 twoplusfiveisseven twoandfiveisseven twoaddedtofiveisseven 3 12 whatis3plustwelve readthefollowing 25 24 4930 12 6minus 减 减号 负号 subtract 减 12 3 9twelveminusthreeisnine threesubtractedfromtwelveisnine readthefollowing 2 2 019 12 797 65 7times multiply乘 twotimesthreeissix twoandthreemultiplymakessix twomultipliedbythreemakes6 readthefollowing 16 4 645 3 15 8divide除 30 6 5thirtydividedbysixisfive readthefollowing 20 4 518 3 6 45 90o apercentage equals anumbershowingdegrees matchthewordswiththepictures signsandnumbers 1ademicalnumber2apairofoddnumbers3afraction4zero5add plus6subtract minus 7multiply times8divide9anumbershowingdegrees10apercentage11apairofnumbers12equals awhatdoyouknowabout j f c b a l i d h k g e vocabulary 1abacus anoldformofcalculator2accurate withnomistakes3ancient veryold4atleast notlessthan5bead asmallballwithaholethroughthemiddle6calculate usenumberstofindanswers7consistof bemadeupofsomething8develop growbiggerand orbetter9electronic usingelectronsforpower vocabulary 10electronic usingelectronsforpower11figure asymbolratherthanaword12flash averyshorttime aninstant13however yet14international connectedtomorethanonecountryornation15invent makeforthefirsttime16nearly almost17powerful strong18system groupofthings partsthatworktogether fillintheblankswithcorrectwords ifyou 8and5 youget13 iusethepocket tocheckmyanswers theunisan organizationwhichhelpstokeepapeacefulworld theundergroundispartofshenzhen stransport the chinesedrewpicturestoshowdifferentmeanings add calculator international system ancient fillintheblankswithcorrectwords 6 beforecalculatorswereinvented thechinesepeopleused tocount 7 weatherreportsarenotalways edison thelightbulbafterhehadfailedmanytimes ifyou 8from16 youget8 ourcountryismore thanbefore ifyou 28by7 theansweris4 thecommittee oftenmembers abacus accurate invented subtract powerful divide consists c1findthesewordsinthearticleonpage73 readthewordsaroundthemandchoosethebestmeanings 1ancient manymanyyearsago2consistsof includes3invented madeforthefirsttime4accurate withoutmistakes5percentages amountsoutofahundred c2findthewordsincolumnainthediaryonpage62andmatchthemwiththemeaningsincolumnb a1international2system3developed4calculate5bottom6powerful bagrewbiggerorstrongerbagroupofthingsworkingtogetherccountwithnumbersdstrongeusedbymorethanonecountryornationfinthelowestplace c3whatdothefollowingdescriptionsreferto writedownthecorrectnamesintheblanks 1acalculatingmachinethatuseswiresandheads an 2asmallmachinethatdoescalculations a 3averypowerfulmachinefordoingcalculations a abacus calculator computer calculatingmachine anabacus calculatingmachine oneofthefirstcalculatingmachinesaccurateandfastrepresent beads wires 5 724 thousands hundreds tens ones anabacus calculatingmachine anelectroniccalculator add subtract multiply divide percentage squareroot calculate calculatingmachine anelectroniccalculator a whatcananelectroniccalculatordo b itcan and a whatelsecanitdo b itcancalculate and add subtract multiply divide percentages squareroots calculatingmachine a isavery calculatingmachine itcandoacalculationthatyoucouldnotdo acomputer computer powerfulinaflashinyourwholelifetime powerful inaflash inyourwholelifetime numbers everyone slanguage ancientnumbersinancienttimes peoplewrotenumbersinmanydifferentways however theynearlyallcountedintens differentwaysofwritingthenumber6 在古代 以很多不同的方式 以十为单位 numbers everyone slanguage zero 0 thesystemofnumberstodayconsistsofthenumbersfrom1to9and0 zero theindiansfirstinventedanddevelopedthe1to9systemofnumbers theytheninventedthezero theinventionofthezerohelpedpeoplewritebignumbersandcalculatemoreeasily nowuseeachofthesetennumbersoncetowritethebiggestnumber whatisit 数字体系 由 组成 印度人 发展 invent v inventionn inventorn 9876543210 numbers everyone slanguage calculatingmachines 计算工具 oneofthefirstcalculatingmachineswasanabacus abacusesarefastandaccurate ontheabacus thebeadsonthewiresstandforones tens hundredsandthousands startingfromthebottomwire 珠子 代表standfor 底部的横杆 theabacusinthepictureshowsanumber writeitdowninfiguresandtheninwords multiplyitbyzeroandthenadd1 whatistheanswer 用数字 用文字 numbers everyone slanguage modernelectroniccalculatorscanadd subtract multiplyanddivide itcanalsocalculatepercentagesandsquareroots 平方根 numbers everyone slanguage computersareverypowerfulcalculatingmachines acomputercandoacalculationinaflash butyoumightnotbeabletodoitinyourwholelifetime 强大的 做计算 一瞬间 能够做 一辈子 dfindthefacts mayisaskingtmli thewriter somequestionsabouthisarticleonnumbers hisanswersarenotalwaysclear readthearticleandmakeli sanswersclearer writeonewordineachblank dfindthefacts 1everyoneknowsit knowswhat thelanguageofnumbers 2longago peoplewrotetheminmanydifferentways wrotewhat numbers dfindthefacts 3 peopleallcountinthisway inwhatway intens 4 theindiansfirstinventedthatsystemofnumbers whichsystemofnumbers 1to9 5 theinventionhelpedpeoplewriteinbignumbers whatinvention zero dfindthefacts 6 theyarefastandaccurate what abacuses 7computersareverypowerfulones verypowerfulwhat calculatingmachines ereadandthink giveanswerstothesequestionsaboutthearticle 1howdidpeopleinancienttimescountinthesameway theynearlyall 2whatdothebeadsonthewiresofanabacusstandfor thebeadsstandfor startingfromthebottomwire 3whatcanamodernelectroniccalculatordo itcan countedintens ones tens hundredsandthousands add subtract multiplyanddivide ereadandthink giveanswerstothesequestionsaboutthearticle 4whatelsecanamodernelectroniccalculatordo icanalso 5howquicklycanacomputerdoacalculation icandoacalculation calculatepercentagesandsquareroots inaflash findthephrases 以不同的方式数字体系由 组成电子计算器平方根一瞬间以十为单位计算 代表9做运算10在古代 1indifferentways2thesystemofnumbers3consistof bemadeupof4electroniccalculators5squareroots6inaflash7countintens8standfor9doacalculation10inancienttimes synopsisbyparagraph p1 ancientnumbers inancienttimes numberswerewrittenindifferentways butcountingwasnearlyalwaysintens synopsisbyparagraph p2 zero everyoneusesthenumbersystem1to9plus0 thesystemwasinventedbytheindians zeromakesiteasiertowritebignumbersandtocalculate synopsisbyparagraph p3 5 calculatingmachines descriptionsofthreecalculatingmachines theancientabacus themodernelectroniccalculatorandthecomputer 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 language aimperativesentences whenwegiveordersorinstructionstopeople wetellthemtodoornottodosomething weusuallystartthesentenceswithaverb weoftenmakeinstructionsmorepolitebystartingwithplease sometimeswestartwiththenameofthepersonreceivingtheinstruction readtheinstructionsbelow bequiet pleasehaveaseat david payattention don tbeafraid pleasedonotmakeanoise alan don tbelate readthedialoguesandcompletethemwithimperativesandthecorrectformoftheverbsinbrackets 1it sherbirthdaynextweek then heraboutthesurpriseparty 2howcanigettopeople shospital alongthestreetand leftatthelights 3wehavetofinishtheworkintwohours thenlet s anytime 4 somuchnoise please ok 5 out there sacarcoming thanks don ttell go turn notwaste don tmake look add3and9 subtract3from9 multiply3by9 divide9by3 binstructionsandstatementsaboutnumbers tablei 3plus9equals is12 9minus3equals is6 3multipliedby9equals is27 9dividedby3equals is3 binstructionsandstatementsaboutnumbers tableii workinpairstoworkouttheproblems s1tellss2todothefollowingsums s2listensandreplies thencheckyouranswerstogether b1pairwork b1pairwork 1add11and1 2subtract5from13 3multiply7by8 4divide16by4 5add9and6 6add14and4anddividetheanswerby2 7subtract9from19andmultiplytheanswerby3 s1 b1pairwork 11plus1equals12 13minus5equals8 7multipliedby8equals56 16dividedby4equals4 9plus6equals15 14plus4dividedby2equals9 19minus9multipliedby3equals30 s2 b2pairwork apuzzle 1thinkofanumber butdon ttellmewhatitis 2add1 3multiplytheanswerby2 4nowadd3 5nowmultiplyby2again 6nowsubtract10 7nowtellmetheanswer ccardinalandordinalnumbers saythesecardinalnumbers 3133032515505461660679199098 21002002103751 0004 18915 362100 000 ccardinalandordinalnumbers 3284 653twohundredandeighty fourthousandsixhundredandfifty three1 000 000onemillion1 367 982onemillionthreehundredandsixty seventhousandninehundredandeighty two ccardinalandordinalnumbers saythesesentenceswithordinalnumbers positioninclassmay 1mayisfirst alan 2danny 3june 4peter 12alice 19steve 28 ccardinalandordinalnumbers saythesedecimals 3 pointthree0 3zeropointthree 368pointthreesixeight7 145sevenpointonefourfive36 36thirty sixpointthreesix speaking atalktime a1readthesetelephonenumbers 2921514325651351247101222389416720105100272455662978112123564399 whenwesaytelephoneoridcardnumbers wesayeachnumberseparately for0wesayzerooroh whentwoofthesamenumberaretogether