初中全英课程学习-Division-of-Decimals

DividingDecimalsDividingaDecimalbyaWholeNumber•Placethedecimalpointinthequotientdirectlyabovethedecimalpointinthedividend.•Divideasyounormallywould(DMSCB)Example512.5.DMSCB210255250Example29101.52.19111925218728720DividingaDecimalbyaDecimal•Movethedecimalpointinthedivisortotheright,untilyougettotheendofthedigits.•Counthowmanyplacesyoumovedthatdecimal.•Movethedecimalpointinthedividendthesamenumberofplacestotherightthatyoumovedthedecimalpointinthedivisor.Example0.36.72onespace0367.2Newproblem367.2DMSCB.260726124120Example23.22.243222.4.32x516032x825632x722472240Example30.3813.3Thedecimalmustbemoved2spacestotheright.Whenwemovethisone2spaces,wefindthatweneedtoaddaspace.Whatwillwefillitwith?Answer:Fillitinwitha0.13.3becomes1330SO,ourproblembecomes038into1330.038isthesameas38.38133038x519038x415238x3114311419051900Example42.481.3392248133.92248133.92.248x51240248x6148851240992248x499249920TerminatingandRepeatingDecimals•Aterminatingdecimalisadecimalthatstops,orterminates.•Examples:1.25or0.892•Arepeatingdecimalisadecimalthathasarepeatingdigitorarepeatinggroupofdigits.•Examples:1.3333…or.121212121…•Repeatingdecimalsusuallyhaveabaracrosstherepeatingportion.2.36287566.0.07564005400Terminatingdecimal56.0.8482003182003182Thisisarepeatingdecimal..83TimeForHomework!