中考英语复习课件专题四数词

Special TopiconEnglish ReviewCoursewareforMid•Classification of Numbers•The Usage ofNumbers目录•Conversion ofNumbers•Mistakes inNumbers•Practice questions onnumbers01Classification ofNumbersIntegerSummaryAninteger refersto anumber withouta decimalpart,which canbe positive,negative,orzero.Detailed descriptionintegersinclude positiveintegers such as1,2,3,zero,and negativeintegers such as-1,-2,-

3.The applicationof integersin mathematicsand dailylife isvery extensive,such asage,quantity,time,etc.FractionSummaryA fractionis anumber thatrepresents therelationship betweenparts and the whole,consisting ofnumeratorand denominator.Detailed descriptionFractionscan representanything thatis notan integer,such as1/2,2/3,etc.Fractions areveryimportant infields such as mathematics,science,and engineeringbecause theycan accuratelyrepresentcertain quantitiesor ratios.DecimalSummaryDecimal is a typeof decimal number thatcan accuratelyrepresentfractions orirrational numbers.Detailed descriptionDecimalsconsist ofinteger anddecimal parts,such as

0.5,

3.14,etc.Decimals arevery usefulin dailylife andscientific calculations,such asmeasuringand calculatingprices.PercentageSummary wordDetailed descriptionPercentageis anumber thatA percentageis aspecial fractionorrepresents therelationship betweendecimal commonly used to representparts andthe whole,usually used to VSproportion orprobability,such asindicateprobability orproportion.50%representing ahalf probabilityor50%discount.Percentages areverycommon infields such as business,statistics,and socialsciences.02The Usage of NumbersTimeexpression•Summary:Mastering time expression is a veryimportant partofEnglish learning,which involvesthe expression of timeorder,timeperiods,and timepoints.•Detailed description:In English,time expressionis usuallyexpressed ona12hour or24-hour basis.The12hoursystem dividesa dayinto morningand afternoon,while the24hour systemcontinuously countsfrom00:00to23:

59.In timeexpression,it isnecessary to master howto useprepositions at,in,and ontorepresenttime,suchas at3oclock,in themorning,and onSunday.In addition,it isnecessary tounderstand theexpression oftimeperiods,such asfrom8to10,between9and11,etc.Sequential expression•Summary word:Sequential expressionis animportant wayto describethe order of events in English,which involvesusing correctconjunctionsand phrasesto expressthe orderof events.•Detailed description:In English,commonlyusedsequential conjunctionsinclude first,second,third,etc.Adverbssuch as then,after that,in theend,etc.can also be usedto describetheorderofevents.In addition,it isnecessaryto mastersome conjunctionsthat indicatecausal relationships,such asbecause,so,therefor,etc.When expressingorder,attention shouldbe paid to logicand organizationto ensurecoherence andsmoothnessbetween sentences.Divisor expression•Summary:The expressionof fractionsisaspecial grammarpoint inEnglish,which involvesthe correctuse ofnumerators anddenominators,as wellastheexpressionofdifferent fractionforms.•Detailed description:In English,fractions arecomposed ofnumerators anddenominators,with denominatorsrepresentedby cardinalnumerals andnumerators representedby ordinalnumerals.For example,two-thirds canbeexpressed astwo things,where thirdis anordinal wordand threeisacardinal word.In addition,it isnecessarytomastersome specialways ofexpressing scores,such asone inthree representingone-third andoneout ofthree representingone-third.At thesame time,attention shouldalsobepaidto the conversionbetweenscores andpercentages,such astwo fistsbeing equalto40%.03Conversion ofNumbersDecimal conversion•Summary:The methodof convertingdecimal numbersto otherdecimal numbers.•Detailed description:When convertingdecimal numbersto otherdecimalnumbers,certain rulesand stepsneedto befollowed.Firstly,determine the target decimalnumber,then splitthe decimalnumber intodifferent bitsbased on itsbase andweight table,and convertit accordingto theweight table.For example,the processofconverting thedecimalnumber25to abinary number is:25/2=12remainder1,12/2=6remainder0,6/2=3remainder0,3/2=1remainder1,1/2=0remainder

1.Therefore,the binaryrepresentation of25is

101001.Hexadecimal conversion•Summary:The methodof convertinghexadecimal numberstoother base numbers.•Detailed description:The conversionmethod betweenhexadecimal numbers and otherhexadecimalnumbers issimilar.Firstly,the targethexadecimal numberis determined.Then,based onthe baseand weighttableof the hexadecimal number,thehexadecimalnumberissplit intodifferent bits and convertedaccordingtotheweight table.For example,the processof converting a hexadecimalnumber AFto adecimalnumber is:A16^1+F16^0=17*16+15=

277.Binary conversionSummary:The methodof convertingbinary Detaileddescription:The conversionmethodnumbers toother base numbers.between binarynumbersandother basenumbersis similar.Firstly,thetargetbasenumberisdetermined.Then,basedonthe baseand weighttableof thebasenumber,the binarynumber issplitinto variousbitsandconverted accordingtothe weighttable.For example,the processofconverting binarynumber1010to decimalis:0*2^3+1*2^2+0*2^1+1*2^0=0+4+0+1=

5.04Mistakes inNumbersThe Usageof Zero0102030405Summary:The usageDetails Indates,the absenceIn times,00is usedFor measurements,of zeroinEnglishcan of a month or dayis toindicate thehour,zero isused tobecomplex,especially indicatedby th,not not0indicate thepresencewhen dealingwith0thor0of aquantity,but itdates,times,and shouldbe spelledoutmeasurements aszero insteadof0Usageoffractions0102030405Summary:Fractions inDetails Fractionsare Whenwriting Fractionscan alsobeEnglish areusedtocommonly written as fractionsin numbers,writtenasdecimals,express partof atwo ormore words,the denominatoris butthe meaningmaywhole ora partofasuchashalf orwritten first,followed changedepending onquantitythree quartersby aslash/,andthecontextthen thenumeratorFor example,2/3Usageofdecimals0102030405Summary:Decisions DetailsDecimals arewritten Whenrounding Decimalsare alsoareused inEnglish towith aperiod.to decimals,the usedinexpress fractionsthat separatethe integerappropriate roundingmeasurements,suchcannot beexpressed andfractional partsterm shouldbe used,as temperatureandas wholenumbers orFor example,

3.14suchasround up,speed,where theyfractionsreports threepoints rounddown,or providemoreone fourround tothe nearestprecision informationthanfractions orwholenumbers05Practice questions onnumbersMultiple choicequestionsMultiple choicequestions onbasic numbersThesequestions testthe studentsunderstanding ofbasic numberssuch ascardiacnumbers e.g.,one,two,three andordinal numberse.g.,first,second,thirdMultiple choicequestionsonfractionsThese questionsfocus onthe studentsability tounderstand anduse fractions,including understandingthe difference between perfectfractions andmixednumbersCompletionNumerical completiontasksThese tasksask the student tocomplete apresence orpass byfilling inthecorrect numericalFor example,I have__apps orThe classisdivided into__groups.Numerical conversiontasksThese tasksask thestudent toconvert agiven numberfrom oneformto another,so asconvertingaCardinal numberto anordinal numberorvice verseReading comprehension questions要点一要点二ReadingcomprehensionReading comprehensionquestionson timequestionsonmeasurementThese questions ask thestudent to read apassage Thesequestionsaskthestudenttoreada passageabouttimee.g.,time zones,telling timeand thenabout measuremente.g.,metric units,convertinganswer questions about thepassage,suchasWhat ismeasures andthen answerquestionsaboutthethe timedifferencebetweenNew Yorkand Beijingpassage,suchasHow manykilometers arein aorHow manyhours arein aday mileor Whatis theweight ofa kilogramingrams感谢观看THANKS。