广东省深圳市宝安区上寮学校七年级英语上册《Chapter4 The world of numbers》课件 牛津版.ppt

chapter4 theworldofnumbers contents readinglisteninglanguagespeakingwriting reading awhatdoyouknowabout weallusenumbersinourdailylife numbersareaninternationallanguage let slearnthelanguageofnumbers 1 adecimalnumber 小数 0 65 zeropointsixfive zeropointsixty five 8 08 eightpointoeight pleasereadthefollowing 7 65 3 12 0 09 86 20 3 evennumbers 偶数 300 42apairofevennumbers4 zero 零 2 oddnumbers 偶数 25 11apairofoddnumbers 1 2 onehalf2 3 twothirds1 4 aquarter1 10 onetenth 5 afraction 分数 pleasereadthefollowing 3 8 6 12 1 7 3 83plus5is8 add3and5 youcanget8 q howtosay 4 12 whatis4plus12 6 plus add 加 pleasereadthefollowing 15 16 419 10 12 3 912minus3is9 subtract3from12 youcanget9 q howtosay 5 2 whatis5minus2 pleasereadthefollowing 2 2 017 4 7minus 减 减号 负号 subtract 减 2times3issix multiply2by3 youcanget6 pleasereadthefollowing 10 4 405 3 15 8multiply times 乘 30 6 5divide30by6is5 30dividedby6is5 pleasereadthefollowing 20 2 1018 3 6 9divide 除 10 45 anumbershowingdegreesdegree 度 度数11 60 apercentage 百分数 sixtypercent12 equals is matchthewordswiththepictures signsandnumbers d e f g h i j k l 1adecimalnumber 4zero 11apairofevennumbers 8divide 5add plus 6subtract minus 7multiply times 12equals 9anumbershowingdegrees 10apercentage 2apairofoddnumbers 3afraction 1invent makeforthefirsttime2system groupofthings partsthatworktogether3especially 4 atleast 5international usedby connectedwithmorethanonecountry nation6ancient veryold7however but vocabulary 8nearly almost9count 10consistof bemadeupofsth 11india 12 develop growbiggerand orbetter13accurate withnomistakes14bead vocabulary 15wire 16standfor 17bottom 18figure19electronic usingelectronsforpower20powerful strong21 inaflash vocabulary howmanylanguagesdoyouknow everyoneknowsatleasttwo hisorherownlanguageandtheinternationallanguageofnumbers numbers everyone slanguage 他或她自己的语言 ancientnumbersinancienttimes peoplewrotenumbersinmanydifferentways however theynearlyallcountedintens differentwaysofwritingthenumber6 在古代 以很多不同的方式 以十为单位 zerothesystemofnumberstodayconsistsofthenumbersfrom1to9and0 zero theindiansfirstinventedanddevelopedthe1to9systemofnumbers theytheninventedthezero theinventionofthezerohelpedpeoplewritebignumbersandcalculatemoreeasily nowuseeachofthesetennumbersoncetowritethebiggestnumber whatisit 数字体系 invent v inventionn inventorn calculatingmachines 计算工具 oneofthefirstcalculatingmachineswasanabacus abacusesarefastandaccurate ontheabacus thebeadsonthewiresstandforones tens hundredsandthousands startingfromthebottomwire 底部的横杆 算盘 theabacusinthepictureshowsanumber writeitdowninfiguresandtheninwords multiplyitbyzeroandthenadd1 whatistheanswer 以单词的形式 以数字的形式 modernelectroniccalculatorscanadd subtract multiplyanddivide itcanalsocalculatepercentagesandsquareroots 平方根 calculatorn calculatev calculatingadj computersareverypowerfulcalculatingmachines acomputercandoacalculationinaflash 做次计算 一瞬间 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 dfindthefacts mayaskstmli thewriter somequestionsabouthisarticleonnumbers hisanswersarenotalwaysclear readthearticleandmakeli sanswersclearer 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 ereadandthinkgiveanswerstothesequestionsaboutthearticle workinpairs 1 howdidpeopleinancienttimescountinthesameway theynearlyallcountedintens 2 whatdothebeadsonthewiresofanabacusstandfor thebeadsstandforones tens hundredsandthousands startingfrombottomwire ereadandthinkgiveanswerstothesequestionsaboutthearticle workinpairs 1 howdidpeopleinancienttimescountinthesameway theynearlyallcountedintens 2 whatdothebeadsonthewiresofanabacusstandfor thebeadsstandforones tens hundredsandthousands startingfrombottomwire 3 whatcanamodernelectroniccalculatordo itcanadd subtract multiplyanddivide ereadandthinkgiveanswerstothesequestionsaboutthearticle workinpairs 4 whatelsecanamodernelectroniccalculatordo itcanalsocalculatepercentagesandsquareroots 5 howquicklycanacomputerdoacalculation itcandoacalculationinaflash 1以不同的方式2数字体系3由 组成4电子计算器5平方根6一瞬间7做次运算8在古代 findthephrases 1indifferentways2thesystemofnumbers3consistof4electroniccalculators5squareroots6inaflash7doacalculation8inancienttimes language readtheinstructionsbelow bequiet pleasehaveaseat david payattention don tbeafraid pleasedonotmakeanoise alan don tbelate imperativesentences 1 it sherbirthdaynextweek thendon ttellheraboutthesurprisebirthday 2 howcanigettopeople shospital goalongthestreetandturnleftatthelights readthedialoguesandcompletethemwithimperativesandthecorrectformoftheverbs 3 wehavetofinishtheworkintwohours thenlet snotwasteanytime 4 don tmakesomuchnoise please ok 5 lookout there sacarcoming thanks binstructionsandstatementsaboutnumbers add3and9 subtract3from9 multiply3by9 divide9by3 3plus9equals is12 9minus3equals is6 3times9equals is27 9dividedby3equals is3 tableii tablei b1pairwork 1add11and1 2subtract5from13 3multiply7by8 4divide16by4 5add9and6 6add14and4andthendividetheanswerby2 7subtract9from19andthenmultiplytheanswerby3 s1 1 11plus1equals12 2 13minus5equals8 3 7times8equals56 4 16dividedby4equals4 5 9plus6equals15 6 14plus4andthendividedby2equals9 7 19minus9andthentimes3equals30 s2 b2pairwork apuzzle 1thinkofanumber butdon ttellmewhatitis 2add1 3multiplytheanswerby2 4nowadd3 5nowmultiplyby2again 6nowsubtract10 7nowtellmetheanswer b3pairwork amagicsquare i ii iii a b c 2 4 5 8 9 7 3 6 1 ccardinalandordinalnumbers saythesecardinalnumbers 1 3133032515505461660679199098 2 1002002103751 0004 18915 362100 000 3284 653twohundredandeighty fourthousandsixhundredandfifty three1 000 000onemillion5 367 982fivemillionthreehundredandsixty seventhousandninehundredandeighty two saytheseordinalnumbers 1st8th21st2nd9th22nd3rd12th23rd4th13th100th5th20th completethesentenceswithorordinalnumbers positioninclassmay 1mayisfirst alan 2alanissecond danny 3dannyisthird june 4juneisfourth peter 12peteristwelfth alice 19aliceisnineteenth steve 28steveistwenty eighth speakingatalktime a4saythesetelephonenumbers 2921514325651351247101222389416720105100272455662978112123564399 whenwesaytelephoneoridcardnumbers wesayeachnumberseparately for0wesayzerooroh whentwoofthesamenumberaretogether wecansaydoublebeforethenumber bspeakup yourschoolreceivedagifto