Rounding to significant figures - Approximation - Edexcel - BBC

Examples · 9|8347 to 1 significant figure is 100,000 · 98|347 to 2 significant figures is 98,000. ChangelanguageEnglishCymraegGaeilgeGàidhligHomeLearnSupportCareersMyBitesizeAllBitesizeRevisequizTestprevious1234567Page3of7nextRoundingtosignificantfiguresThemethodofroundingtoasignificantfigureisoftenusedasitcanbeappliedtoanykindofnumber,regardlessofhowbigorsmallitis.Whenanewspaperreportsalotterywinnerhaswon£3million,thishasbeenroundedtoonesignificantfigure.Itroundstothemostimportantfigureinthenumber.Toroundtoasignificantfigure:lookatthefirstnon-zerodigitifroundingtoonesignificantfigurelookatthedigitafterthefirstnon-zerodigitifroundingtotwosignificantfiguresdrawaverticallineaftertheplacevaluedigitthatisrequiredlookatthenextdigitifit's5ormore,increasethepreviousdigitbyoneifit's4orless,keepthepreviousdigitthesamefillanyspacestotherightofthelinewithzeros,stoppingatthedecimalpointifthereisoneExamplesRound53,879to1significantfigure,then2significantfigures.5|3879to1significantfigureis50,00053|879to2significantfiguresis54,000Noticethatthenumberofsignificantfiguresinthequestionisthemaximumnumberofnon-zerodigitsinyouranswer.Round0.005089to1significantfigure,then2significantfigures.0.005|089to1significantfigureis0.0050.0050|89to2significantfiguresis0.0051QuestionWhatis98,347roundedto1significantfigure,then2significantfigures?Revealanswerupdown9|8347to1significantfigureis100,00098|347to2significantfiguresis98,000QuestionWhatis3.5175roundedto1significantfigure,then2significantfigures?Revealanswerupdown3|.5175to1significantfigureis43.5|175to2significantfiguresis3.5previous1234567Page3of7nextMoreGuidesWholenumbers-EdexcelnextDecimals-EdexcelnextConvertingbetweenfractions,decimalsandpercentages-EdexcelnextApproximation-EdexcelFractions-EdexcelnextMultiplesandfactors-EdexcelnextLawsofindices-EdexcelnextStandardform-EdexcelnextSurds-Higher-EdexcelnextFinancialmathematics-EdexcelnextStrugglingtogetyourheadroundrevisionorexams?Ourtipsfromexpertsandexamsurvivorswillhelpyouthrough.GetadvicehereLinksPersonaliseyourBitesize!Signin,chooseyourGCSEsubjectsandseecontentthat'stailoredforyou.Skillswise:MathsRadio4:MathscollectionBitesizeKS3:Mathsexternal-linkSaveMyExamsSUBSCRIPTIONexternal-linkQuizletexternal-linkRevisioSUBSCRIPTIONexternal-linkJustMathsexternal-linkBlutickGCSESubjectsGCSESubjectsupdownArtandDesignBiology(SingleScience)BusinessChemistry(SingleScience)CombinedScienceComputerScienceDesignandTechnologyDigitalTechnology(CCEA)DramaEnglishLanguageEnglishLiteratureFrenchGeographyGermanHistoryHomeEconomics:FoodandNutrition(CCEA)Hospitality(CCEA)ICTIrish–Learners(CCEA)Journalism(CCEA)LearningforLifeandWork(CCEA)MandarinMathsMathsNumeracy(WJEC)MediaStudiesModernForeignLanguagesMovingImageArts(CCEA)MusicPhysicalEducationPhysics(SingleScience)PSHEandCitizenshipReligiousStudiesScienceSociologySpanishWelshSecondLanguage(WJEC) ExploretheBBCHomeNewsSportWeatheriPlayerSoundsCBBCCBeebiesFoodBitesizeArtsTasterLocalThree