中考英语复习课件专题四数词

SpecialTopiconEnglishReviewCoursewareforMidClassificationofNumbersTheUsageofNumbersConversionofNumbersMistakesinNumbersPracticequestionsonnumbers目录01ClassificationofNumbersSummaryAnintegerreferstoanumberwithoutadecimalpart,whichcanbepositive,negative,orzero.Detaileddescriptionintegersincludepositiveintegers(suchas1,2,3),zero,andnegativeintegers(suchas-1,-2,-3).Theapplicationofintegersinmathematicsanddailylifeisveryextensive,suchasage,quantity,time,etc.IntegerAfractionisanumberthatrepresentstherelationshipbetweenpartsandthewhole,consistingofnumeratoranddenominator.SummaryFractionscanrepresentanythingthatisnotaninteger,suchas1/2,2/3,etc.Fractionsareveryimportantinfieldssuchasmathematics,science,andengineeringbecausetheycanaccuratelyrepresentcertainquantitiesorratios.DetaileddescriptionFractionSummaryDecimalisatypeofdecimalnumberthatcanaccuratelyrepresentfractionsorirrationalnumbers.DetaileddescriptionDecimalsconsistofintegeranddecimalparts,suchas0.5,3.14,etc.Decimalsareveryusefulindailylifeandscientificcalculations,suchasmeasuringandcalculatingprices.DecimalVSPercentageisanumberthatrepresentstherelationshipbetweenpartsandthewhole,usuallyusedtoindicateprobabilityorproportion.DetaileddescriptionApercentageisaspecialfractionordecimalcommonlyusedtorepresentproportionorprobability,suchas50%representingahalfprobabilityor50%discount.Percentagesareverycommoninfieldssuchasbusiness,statistics,andsocialsciences.SummarywordPercentage02TheUsageofNumbersTimeexpressionSummary:MasteringtimeexpressionisaveryimportantpartofEnglishlearning,whichinvolvestheexpressionoftimeorder,timeperiods,andtimepoints.Detaileddescription:InEnglish,timeexpressionisusuallyexpressedona12houror24-hourbasis.The12hoursystemdividesadayintomorningandafternoon,whilethe24hoursystemcontinuouslycountsfrom00:00to23:59.Intimeexpression,itisnecessarytomasterhowtouseprepositionsat,in,andontorepresenttime,suchasat3o'clock,inthemorning,andonSunday.Inaddition,itisnecessarytounderstandtheexpressionoftimeperiods,suchasfrom8to10,between9and11,etc.SequentialexpressionSummaryword:SequentialexpressionisanimportantwaytodescribetheorderofeventsinEnglish,whichinvolvesusingcorrectconjunctionsandphrasestoexpresstheorderofevents.Detaileddescription:InEnglish,commonlyusedsequentialconjunctionsincludefirst,second,third,etc.Adverbssuchasthen,afterthat,intheend,etc.canalsobeusedtodescribetheorderofevents.Inaddition,itisnecessarytomastersomeconjunctionsthatindicatecausalrelationships,suchasbecause,so,therefor,etc.Whenexpressingorder,attentionshouldbepaidtologicandorganizationtoensurecoherenceandsmoothnessbetweensentences.DivisorexpressionSummary:TheexpressionoffractionsisaspecialgrammarpointinEnglish,whichinvolvesthecorrectuseofnumeratorsanddenominators,aswellastheexpressionofdifferentfractionforms.Detaileddescription:InEnglish,fractionsarecomposedofnumeratorsanddenominators,withdenominatorsrepresentedbycardinalnumeralsandnumeratorsrepresentedbyordinalnumerals.Forexample,two-thirdscanbeexpressedastwothings,where"third"isanordinalwordand"three"isacardinalword.Inaddition,itisnecessarytomastersomespecialwaysofexpressingscores,suchas"oneinthree"representingone-thirdand"oneoutofthree"representingone-third.Atthesametime,attentionshouldalsobepaidtotheconversionbetweenscoresandpercentages,suchas"twofists"beingequalto"40%".03ConversionofNumbersDecimalconversionSummary:Themethodofconvertingdecimalnumberstootherdecimalnumbers.Detaileddescription:Whenconvertingdecimalnumberstootherdecimalnumbers,certainrulesandstepsneedtobefollowed.Firstly,determinethetargetdecimalnumber,thensplitthedecimalnumberintodifferentbitsbasedonitsbaseandweighttable,andconvertitaccordingtotheweighttable.Forexample,theprocessofconvertingthedecimalnumber25toabinarynumberis:25/2=12remainder1,12/2=6remainder0,6/2=3remainder0,3/2=1remainder1,1/2=0remainder1.Therefore,thebinaryrepresentationof25is101001.Summary:Themethodofconvertinghexadecimalnumberstootherbasenumbers.Detaileddescription:Theconversionmethodbetweenhexadecimalnumbersandotherhexadecimalnumbersissimilar.Firstly,thetargethexadecimalnumberisdetermined.Then,basedonthebaseandweighttableofthehexadecimalnumber,thehexadecimalnumberissplitintodifferentbitsandconvertedaccordingtotheweighttable.Forexample,theprocessofconvertingahexadecimalnumberAFtoadecimalnumberis:A16^1+F16^0=17*16+15=277.HexadecimalconversionSummary:Themethodofconvertingbinarynumberstootherbasenumbers.Detaileddescription:Theconversionmethodbetweenbinarynumbersandotherbasenumbersissimilar.Firstly,thetargetbasenumberisdetermined.Then,basedonthebaseandweighttableofthebasenumber,thebinarynumberissplitintovariousbitsandconvertedaccordingtotheweighttable.Forexample,theprocessofconvertingbinarynumber1010todecimalis:0*2^3+1*2^2+0*2^1+1*2^0=0+4+0+1=5.Binaryconversion04MistakesinNumbersSummary:TheusageofzeroinEnglishcanbecomplex,especiallywhendealingwithdates,times,andmeasurementsDetailsIndates,theabsenceofamonthordayisindicatedby"th",not"0th"or"0"Intimes,"00"isusedtoindicatethehour,not"0"Formeasurements,zeroisusedtoindicatethepresenceofaquantity,butitshouldbespelledoutas"zero"insteadof"0"0102030405TheUsageofZeroSummary:FractionsinEnglishareusedtoexpresspartofawholeorapartofaquantityDetailsFractionsarecommonlywrittenastwoormorewords,suchas"half"or"threequarters"Whenwritingfractionsinnumbers,thedenominatoriswrittenfirst,followedbyaslash(/),andthenthenumeratorForexample,"2/3"Fractionscanalsobewrittenasdecimals,butthemeaningmaychangedependingonthecontext0102030405UsageoffractionsSummary:DecisionsareusedinEnglishtoexpressfractionsthatcannotbeexpressedaswholenumbersorfractionsDetailsDecimalsarewrittenwithaperiod(.)toseparatetheintegerandfractionalpartsForexample,"3.14"reports"threepointsonefour"Whenroundingdecimals,theappropriateroundingtermshouldbeused,suchas"roundup","rounddown",or"roundtothenearest"Decimalsarealsousedinmeasurements,suchastemperatureandspeed,wheretheyprovidemoreprecisioninformationthanfractionsorwholenumbers0102030405Usageofdecimals05PracticequestionsonnumbersMultiplechoicequestionsThesequestionstestthestudent'sunderstandingofbasicnumberssuchascardiacnumbers(e.g.,one,two,three)andordinalnumbers(e.g.,first,second,third)MultiplechoicequestionsonbasicnumbersThesequestionsfocusonthestudent'sabilitytounderstandandusefractions,includingunderstandingthedifferencebetweenperfectfractionsandmixednumbersMultiplechoicequestionsonfractionsNumericalcompletiontasksThesetasksaskthestudenttocompleteapresenceorpassbyfillinginthecorrectnumericalForexample,"Ihave__apps"or