Logarithm Common and Natural Logarithms

Common Logarithms

Reported by:Mustapha Hadji EsmailAhmad Yusuf Ali

1Content PageCommon LogarithmIntroductionHistoryHenry BriggsCalculatorsCommon Logarithm - HistorySometimes called Briggsian LogarithmNamed after Henry Briggs, a 17th century mathematicianIn calculators, when you press logIt is actually log10 or lgThis is because base 10 logarithms are useful for computationsEngineers often used log to represent log10 Since engineers programmed calculators, log became log10Common Logarithm - HistoryHowever, this is extremely misleading So we have to take note in case we make such a mistake by confusing log10 with logWe often need to make use of logarithms of non-10 basesHence, we will briefly cover the Change of Base LawCommon Logarithm - IntroductionCommon Logarithms are logarithms to base 10

Commonly abbreviated as lgHence, for example

Common LogarithmsA common logarithm has a base of 10.If there is no base given explicitly, it is common.You can easily find common logs of powers of ten.You can use your calculator to evaluate common logs.