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1、外研版外研版 高一年级高一年级(必修必修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：基数词的读法：A.先说先说“几十几十”，再说再说“几几”，中间，中间用连字符。如：用连字符。如：23 89B.先说先说“几百几百”，再加再加and,再加末两位数再加末两位数（或末位数）。如：（或末位数）。如：223 416 809 twenty-three eighty-ninetwo hundred and twenty-threefour hundred and sixte
2、eneight hundred and nineC.1000以上的数先从后向前数，每三位数加以上的数先从后向前数，每三位数加一一“,”（千分位）；第一个（千分位）；第一个“,”号前为号前为thousand;第二个第二个“,”号前为号前为million;第三个第三个“,”号前为号前为billion。如：。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 th
3、ousand,three hundred and oneseven hundred and fifty million2.序数词的读法序数词的读法序数词一般以与之相应的基数词加词序数词一般以与之相应的基数词加词尾尾-th构成，如：构成，如：tenth（第十），但下（第十），但下面这些基数词在变序数词时，面这些基数词在变序数词时，有特别有特别的地方。如：的地方。如：A.one two three five eight nine twelvefirstsecondthirdfiftheighthninthtwelfthB.以以-ty结尾的词，要先变结尾的词，要先变-y为为-i，再加，再加-eth。
4、如：如：twenty fortyC.以以one,two,three,five,nine收尾的多位数词，收尾的多位数词，要照第一条方法变。如：要照第一条方法变。如：twenty-one twenty-two thirty-five ninety-ninea hundred and fifty-three twentiethfortiethtwenty-firsttwenty-secondthirty-fifthninety-nintha hundred and fifty-third基数词表示分子，序数词表示分母，基数词表示分子，序数词表示分母，除了分子是除了分子是“1”的情况外，序数词要的情况
5、外，序数词要用复数。如：用复数。如：2/3 7/9 5/12 one-fourthtwo-thirdsseven-ninthsfive-twelfthstwo and three-fifthsthirty and seven-eighths3.分数词的读法分数词的读法2353078一些特殊的表达法一些特殊的表达法 a/one halfa/one quarterthree quarters4.小数的读法小数的读法7.8 0.4 0.03 0.125 14.397 seven point eightzero point fourzero point zero threezero point one
6、 two fivefourteen point three nine seven5.百分数的读法百分数的读法27%45%86%twenty-seven percent forty-five percent eighty-six percentCan you say the following in English correctly?1,000 2,000 12,000 112,000796,000one thousandtwo thousandtwelve thousandone hundred,twelve thousandseven hundred,ninety-six thousand
7、879,457eight hundred,seventy-nine thousand,four hundred and fifty-seven 1,000,000 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,six hundred and eighty-eight987,654,321ni
8、ne hundred,eighty-seven million,six hundred,fifty-four thousand,three hundred and twenty-one1,000,000,000 one billion9,000,000,000 nine billion32,000,000,000thirty-two billion564,865,000,000five hundred,sixty-four billion,eight hundred,sixty-five million978,876,675,467nine hundred,seventy-eight bill
9、ion,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-sevenPractice2.756,980,000 seven hundred,fifty-si
10、x million,nine hundred and eighty thousand3.345,567,887,987 three hundred,forty-five billion,five hundred,sixty-seven million,eight hundred,eighty-seven thousand,nine hundred and eighty-seven 4.897,786,000,576 eight hundred,ninety-seven billion,seven hundred,eighty-six million,five hundred and seven
11、ty-six5.786,087,670,756 seven hundred,eighty-six billion,eighty-seven million,six hundred,seventy thousand,seven hundred and fifty-six6.987,765,654,345 nine hundred,eighty-seven billion,seven hundred,sixty-five million,six hundred,fifty-four thousand,three hundred and forty-five Read these questions
12、 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 thousand fifty million4.How much is 260,408,396 and 5,284,700?two hundred,sixty-five million,six hundred,ninety-three thousand,ninety-
13、six 5.What is of 1,000,500,000?seven hundred,fifty million,three hundred,seventy-five thousand 6.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 ninety-seven one hundred and elevent
14、hs forty-five eighty-sevenths总结总结:你能看出他们有什么特点吗？你能看出他们有什么特点吗？45/87分子用基数词分子用基数词,分母用序数词分母用序数词;分子大于分子大于1,分母的序数词需要加分母的序数词需要加s。另外另外,还有几个特殊表达的情况还有几个特殊表达的情况:1/21/4 1/3 3/42/3one half one quarter one third three quarters two thirds Now lets say:2/5 5/8 9/10 3/8 5/6Practicetwo-fifths five-eighthsnine-tenthsth
15、ree-eighths five-sixthsCan 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 seven seven point five six four Finish Exercise 9 on P93.Homework