1、外研版高一年级(必修1)Module 5Vocabulary and Vocabulary and speaking speaking 英语中基数词、序数词、分数、小数和百分数的读法1.基数词的读法：A.先说“几十”，再说“几”，中间用连字符。如：23 89B.先说“几百”，再加and,再加末两位数（或末位数）。如：223 416 809 twenty-threeeighty-ninetwo hundred and twenty-threefour hundred and sixteeneight hundred and nineC.1000以上的数先从后向前数，每三位数加一“,”（千分位）；
2、第一个“,”号前为thousand;第二个“,”号前为million;第三个“,”号前为billion。如：1,001 4,000 9,743 174,301750,000,000 one thousand and onefour thousandnine thousand,seven hundred and forty-threea(one)hundred and seventy-four thousand,three hundred and oneseven hundred and fifty million2.序数词的读法序数词一般以与之相应的基数词加词尾-th构成，如：tenth（第十
3、），但下面这些基数词在变序数词时，有特别的地方。如：A.one two three five eight nine twelvefirstsecondthirdfiftheighthninthtwelfthB.以-ty结尾的词，要先变-y为-i，再加-eth。如：twenty fortyC.以one,two,three,five,nine收尾的多位数词，要照第一条方法变。如：twenty-one twenty-two thirty-five ninety-ninea hundred and fifty-three twentiethfortiethtwenty-firsttwenty-seco
4、ndthirty-fifthninety-nintha hundred and fifty-third基数词表示分子，序数词表示分母，除了分子是“1”的情况外，序数词要用复数。如：2/3 7/9 5/12 one-fourthtwo-thirdsseven-ninthsfive-twelfthstwo and three-fifthsthirty and seven-eighths3.分数词的读法2 3530 78一些特殊的表达法 a/one halfa/one quarterthree quarters4.小数的读法7.80.40.030.12514.397seven point eight
5、zero point fourzero point zero threezero point one two fivefourteen point three nine seven5.百分数的读法27%45%86%twenty-seven percentforty-five percenteighty-six percentCan you say the following in English correctly?1,000 2,000 12,000 112,000796,000one thousandtwo thousandtwelve thousandone hundred,twelve
6、 thousandseven hundred,ninety-sixthousand879,457eight hundred,seventy-nine thousand,four hundred and fifty-seven1,000,000 9,000,00032,000,000 212,000,000one million nine millionthirty-two milliontwo hundred,twelve million988,766,688nine hundred,eighty-eight million,seven hundred,sixty-six thousand,s
7、ix hundred and eighty-eight987,654,321nine hundred,eighty-seven million,six hundred,fifty-four thousand,three hundred and twenty-one1,000,000,000 one billion9,000,000,000 nine billion32,000,000,000 thirty-two billion564,865,000,000five hundred,sixty-four billion,eight hundred,sixty-five million978,8
8、76,675,467nine hundred,seventy-eight billion,eight hundred,seventy-six million,six hundred,seventy-five thousand,four hundred and sixty-seven Lets have a match to see who can say the following numbers correctly and quickly.1.765,8472.seven hundred,sixty-five thousand,eight hundred and forty-sevenPra
9、ctice2.756,980,000seven hundred,fifty-six million,nine hundred and eighty thousand3.345,567,887,987three hundred,forty-five billion,five hundred,sixty-seven million,eight hundred,eighty-seven thousand,nine hundred and eighty-seven4.897,786,000,576eight hundred,ninety-seven billion,seven hundred,eigh
10、ty-six million,five hundred and seventy-six5.786,087,670,756seven hundred,eighty-six billion,eighty-seven million,six hundred,seventy thousand,seven hundred and fifty-six6.987,765,654,345nine hundred,eighty-seven billion,seven hundred,sixty-five million,six hundred,fifty-four thousand,three hundred
11、and forty-fiveRead these questions aloud and say the answers.1.What is of 6,000,000?2.2.How much is 35,246,000 plus 12,800,000?3.3.What is 25%of 200,000,000?three millionforty-eight million,forty-six thousandfifty million4.How much is 260,408,396 and 5,284,700?two hundred,sixty-five million,six hund
12、red,ninety-three thousand,ninety-six 5.What is of 1,000,500,000?seven hundred,fifty million,three hundred,seventy-five thousand6.What is 10%of 800,000,000?eighty million 1/5 1/61/74/7one fifthone sixthone seventhfour seventhsCan you say the following in English correctly?7/10 97/111seven tenths nine
13、ty-seven one hundred and elevenths forty-five eighty-sevenths总结:你能看出他们有什么特点吗？45/87分子用基数词,分母用序数词;分子大于1,分母的序数词需要加s。另外,还有几个特殊表达的情况:1/21/4 1/3 3/42/3one halfone quarter one third three quarters two thirds Now lets say:2/5 5/8 9/10 3/8 5/6Practicetwo-fifths five-eighthsnine-tenthsthree-eighthsfive-sixths
14、Can you say the following in English Can you say the following in English correctly?correctly?0.50.80.761.23point fivepoint eight point seven sixone point two three23.45100.3287.6757.564twenty-three point four fiveone hundred point three two eighty-seven point six sevenseven point five six fourFinish Exercise 9 on P93.Homework
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