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1、PEEDf4othemotfcsSecretsofLightningMentalCalculationBILLHANDLEYultllrlghtboohsDedicatedtoBenyominGoldschmiedtAlsobyBillHandley:TeacbYourChildrenThbles(publishedbyandavailablefromTrightbooks)TrightbooksPtyLtdPOBox270ElsternwickVictoria3185Ph:(03)95327082Fax:(03)95327084
2、E-mail:info@wrightbooks.com.auTebsite:www.wrightbooks.com.auOBillHandley2000Thisbookiscopyright.Apartfromanyfairdealingforthepurposeofprivatestudy,research,criticismorreviewaspermittedundertheCopyrightAct,nopartofthispublicationmaybereproduced,storedinaretrievalsystem,
3、ortransmittedinanyformorbyanymeans,electronic,mechanical,photocopying,recordingorotherwisewithoutpriorwrittenpermission.Enquiriestobemadeto'Wrightbooks.NationalLibraryofAustraliaCataloguing-in-Publicationdata:Handley,Bill.Speedmathematics:secretsoflightningmentalcalcula
4、tion.Includesindex.rsBN7876527336.1.Mentalarithmetic-Studyandteaching.I.Title.513.9CoverdesignbyRobCowpePrintedinAustraliabyGriffinPressISBN:1,875527335GontentsPrefacevIntroductionvii1Multiplication:PartOne12UsingaReferenceNumber53MultiplyingNumbersAboveandBelowtheRefer
5、enceNumber1.44CheckingAnswers:PartOne185Multiplication:PartTwo256MultiplyingDecimals397MultiplyingUsingTwoReferenceNumbers4>8Addition569Subtraction5410SquaringNumbers7311ShortDivision85t2LongDivisionbyFactors9013StandardLongDivision95t4DirectDivisionbyaTwo-DigitNumber10
6、2t5CheckingAnswers:PartTwo1101,6EstimatingSquareRootsr1,517CalculatingSquareRootsr2518FunShortCuts1'34t1lGontents(Cont'd)19AddingandSubtractingFractionst5020MultiplyingandDividingFractions1,562lDirectMultiplication16222EstimatingAnswers16923UsingWhatYouHaveLearnt173Afte
7、rword181AppendixAFrequentlyAskedQuestionsr83AppendixBEstimatingCubeRootsr8gAppendixCChecksforDivisibiliry196AppendixDWhyOurMethodsWork205AppendixECastingoutNines-Vhyit'$forks270AppendixFSquaringFeetandInches21.2Glossary214Index2r71VPretaceManypeoplehaveaskedmeifmymethod
8、saresimilartothosedevelopedbyJakowTrachtenberg.Heinspiredmillionswithhismethodsandrevolutionaryapproachtomathe
