最新初中全英课程学习-Decimals精品课件 10页

PlaceValuewithDecimalsChapter1.2第一页，共10页。\nHowdoIknowwhatkindofdecimalitis?ThenameofadecimalisdeterminedbythenumberofplacestotherightofthedecimalpointNumberofPlacesDecimalNameExample1tenths0.72hundredths0.053thousandths0.016第二页，共10页。\nWhataremixeddecimals?MixeddecimalsarenumberswithbothwholenumbersanddecimalsThenameofawholenumberisdeterminedbythenumberofplacestotheleftofthedecimalpointInthenumber128.765,1isinthehundredsplace,2isinthetensplace,8isintheonesplace,7isinthetenthsplace,6isinthehundredthsplace,and5isinthethousandthsplace第三页，共10页。\nHowdoyoureaddecimals?Toreadadecimalcorrectly,firstfindthedecimalpointWholenumbersaretotheleftofthedecimalpoint;anynumberstotherightofadecimalpointformadecimalfractionSay“and”forthedecimalpointThedecimal2164.511isreadas“twothousand,onehundredsixty-fourandfivehundredeleventhousandths”第四页，共10页。\nZerosafterthedecimalpointWritingextrazerosafterthedecimalpointdoesnotchangethevalue!Thedecimals0.2,0.20,and0.200areequivalentdecimals第五页，共10页。\nHerearesomepracticeproblemsinwhichIwillworkthroughwithyoutomakesurethatyouunderstandthemainconceptscovered.Practice第六页，共10页。\nExercise1Writethedecimals.FivethousandthsNinety-fourthousandthsThreehundredthirty-sixandsixty-ninehundredths第七页，共10页。\nExercise2Writeeachdecimalinwords.7884.0115592.44.203612.25010.44第八页，共10页。\nExercise3Inwhatplace(ontheplacevaluechart)istheunderlineddigit?Writetheanswer.1.4753.7637780.215412.407902.103第九页，共10页。\nExercise4Writeadecimalthathasthesamenumber.0.25.51410.6753.809第十页，共10页。