【教育资料】小升初英语专项指导-数词相关复习资料_通用版学习精品
六年级下册英语素材-小升初语法专项 数词讲解 全国通用
数词一、数词的概念表示数量的词。
二、数词的分类：基数词和序数词。
（一）基数词：表示“数量”的词叫做基数词。
我们常说的one ,two ,three….基数词的“读法”及“写法”口诀：基数词很容易，一到十二单独记；十几拼写有特点，teen加在几后面；说到整十也简单，几字后面ty 添；若要表示几十几，几十加横再加几，要问几百几十几，几百and 几十几；特殊情况有八个，五个几十，仨十几。
（thirteen, fifteen, eighteen，twenty, thirty, forty, fifty, eighty）见下表：（必背会）解析：1. 数字“1—12”：个别记忆。
2. 数字“13—19”：是在个位后面+teen。
fourteen, sixteen, seventeen, nineteen.但有特殊性：three—thirteen five—fifteen eight—eighteen3. 数字“几十”：是在个位后面+ty。
sixty, seventy, ninety但有特殊性：two—twenty, three—thirty, four—forty (去u) , five—fifty, eight—eighty,4. 数字“几十几”(21-99)：在“十位数”和“个位数”之间+ 连字符“-”构成。
e.g. 24 = twenty-four 73= seventy-three 口诀：几十加横再加几5. 数字“几百几”(101-999)：百位hundred 之后+and。
e.g. 123 one hundred and twenty-three 解析：口诀：几百and几十几6. 数字“1,000”以上：e.g. 50，000 = fifty thousand (注意：thousand 后不用加s)基数词的用法1. 口诀：具体数字两无(-s, of); 泛指数字两有(+s, of)例如：300名学生three hundred students成百上千的学生hundreds of students几百个学生several hundred students(1) There are two______ students in our school.A. hundredB. hundredsC. hundred ofD. hundreds of(2) After the war, thousands of (成千上万) people became homeless.2. 口诀：“数—单名”做“定”语She is an 8-year-old girl. = She is 4 years old. 她是一个4岁的小女孩。
小升初英语语法讲解：数词-通用版
教学目标：1. 掌握基数词、序数词的用法和读法及序数词的构成2. 掌握数字的读法3. 掌握hundreds / thousands/ millions of 等表示不定数目的构成和用法4. 掌握时间、日期、年龄的表达，了解分数、小数、百分数的表达考情分析：一、认识基数词和序数词【区别】基数用于表示数量的多少，前面没有“the”。
序数词用于表示次序，常在日期中出现，前面一定要有“the”。
提问：第二个数学老师答案：the second Math teacher提问：我的第二个数学老师答案：my second Math teacher【小升初考点】：1. 超过二十以上的两位数需要在个位和十位之间加上“-”。
提问：21答案：twenty-one2. 用基数词来修饰可数名词时，一定别忘了使用可数名词的复数形式。
提问：十八个男孩答案：eighteen boys3. 用基数词修饰不可数名词时，如是复数，将它的量词变为复数。
提问：两碗米饭答案：two bowls of rice4. 序数词一般在词尾加“th”, 特殊的有：first, second, third, fifth, eighth, ninth, twelfth二十及二十以上的整十：twentieth, thirtieth, fortieth…“第几十几”：前面整十不变，后面的“几”改为序数词。
如：第88 eighty-eighth【口诀】巧记基数词和序数词：基变序，有规律，1,2,3,特殊记,加th从4起;8少t,9去e；逢5逢12，f代替v和e;20至90,y变成ie;几十几,几百几提问达：___________________________________________答案：three hundred注意：hundreds of thousands ofmillions of billions of正确读出下列数字284 two hundred （and） eighty-four5,599 five thousand five hundred （and） ninety-nine3,758,521 three million seven hundred （and ）fifty-eight thousand five hundred （and） twenty-one1,234,567,890 one billion two hundred (and) thirty-four million five hundred (and) sixty-seven thousand eight hundred (and) ninety三、数字的表达【词汇】half, quarter1. 分数的表达：【超级公式一】分子基，分母序1/2 a half1/3 one third1/4 one fourth或a quarter【超级公式二】分子大于1，分母用复数2/3 two thirds2. 百分数的表达：【超级公式三】数字＋percent30% thirty percent3. 小数的表达：【超级公式四】数字＋point＋单个数字0.1 zero point one0.01 zero point zero one12.53 twelve point five three4. .时间的表达：【超级公式五】整点: 数字+ o’clock3:00 three o’clock【超级公式六】直接读数字2:35 two thirty-five8:49 eight forty-nine【超级公式七】过几分、差几分(简笔画四行)4:20 twenty past four9:30 thirty past nine or half past nine11:15 fifteen past eleven or a quarter past eleven（简笔画空隙5厘米）7:55 five to eight11:45 fifteen to twelve or a quarter to twelve提问：1:58如何读？答案：two to two5. 日期的表达：【句型】What day…? What’s the date…?【词汇】月份：January, February, March, April, May, June, July, August, September, October, November, December星期：Sunday, Monday, Tuesday, Wednesday, Thursday, Friday, Saturday 【超级公式八】月日（序），年July 10 (th), 2012 读法：July the tenth, two thousand (and) twelve March 2 (nd), 1973 读法：March the second, nineteen seventy-three6. 年龄的表达：【超级公式九】s害怕连词线She is 12 years old.She is a 12-year-old girl.【考题链接】1. 请翻译下列短语。
小升初英语专题-- 数词
数 词一．教学内容1．复习上节课的内容，巩固上节课的重难点2．新课讲解基数词：表示数目的词为基数词，它的构成如下表： 范 围 特 点实 例 1~12 无规律 one, two, three, four, five, six, seven, eight, nine, ten, eleven,twelve13~19 以teen 为结尾 thirteen, fourteen, fifteen, sixteen, seventeen, eighteen,nineteen20~90 以ty 结尾twenty, thirty, forty, fifty, sixty, seventy, eighty, ninety 21~99 十位与个位之间要加连字符 “-”twenty-five, sixty-five, ninety-nine101~999 百位与十位之间通常用andthree hundred and twenty-five （美语中常将and 省略） 千以上 6275—six thousand two hundred and seventy-five ；1200—twelve hundred（二）序数词：表示顺序的数词为序数词，它的构成如下表：范 围 特 点 实 例1~19 各基数词尾加th 其中七个例外：first, second, third, fifth, eighth, ninth,twelfth, 其余，如：four — forth, six — sixth, nineteen — nineteenth20,30~90 把y 变i 后加eth twentieth, fortieth, ninetieth21以后多位数最后一个数用序数词，其余用基数词 21st — twenty-first, 110th — one hundred and tenth1.数词的概述基数词表示数目或数量的多少。
序数词表示顺序或等级。
【最新】小升初英语专项指导-数词相关复习资料通用版
小升初英语数词相关复习资料英语数词定义和特征1、表示"多少"和"第几"的词，叫做数词(numeral)。
2、数词与不定代词相似，其用法或者相当于形容词，或者相当于名词。
种类1、基数词表示"多少"的词叫做基数词(cardinal numeral)，如：one (一)，twenty(二十)，hundred(百)等。
2、序数词表示"第几"的词叫做序数词(ordinal numeral)，如：first (第一)，twentieth (第二十)，hundredth(第一百)等。
基数词100以下的基本的墓数词1 one[wQn] 11 eleven[i5levn]2 two[tu:] 12 twelve[twelv]3 three[Wri:] 13 thirteen [5We:5ti:n]4 four[fC:] 14 fourteen5 five [faiv] 15 fifteen [5fif5ti:n]6 six[siks] 16 sixteen7 seven [5sevn] 17 seventeen8 eight [eit] 18 eighteen[5ei5ti:n]9 nine[nain] 19 nineteen10 ten[ten] 20 twenty [5twenti]21 twenty-one [5twenti5wQn] 60 sixty30 thirty [5WE:ti] 70 seventy40 forty [5fC:ti] 80 eighty50 fifty[5fifti] 90 ninety说明：1、13-19皆以后缀-teen[5ti:n]结尾，它们都有两个重音。
注意thirteen，fifteen，eighteen 的发音和拼法。
2、20-90第十位数的整数均以后缀-ty[ti]结尾。
3、十位数和个位数之间须用连字号"-"。
(完整版)小升初英语数词专项
数词一、定义：表示数目或顺序。
二、分类：分为基数词和序数词两种。
表示数目或数量多少的词叫基数词；表示数目顺序的词叫序数词。
三、基数词的构成：1）1-12的基数词是独立的单词，即：one，two，three，four，five，six，seven，eight，nine，ten，eleven，twelve。
2）13-19的基数词以-teen结尾。
如：fourteen，seventeen等，但13，15，18较特殊，13—thirteen, 15—fifteen, 18—eighteen。
3）20-90的整十位均以-ty结尾。
如：sixty，ninety，但20，30，40，50，80较特殊，20—twenty, 30—thirty, 40—forty, 50—fifty, 80—eighty。
4）十位数与个位数之间要加连字符号"-"，如：28-twenty-eight，96-ninety-six。
5）百位和十位（若无十位则和个位）之间加and，如：148—one hundred and forty-eight406—four hundred and six6）hundred（百），thousand（千），million（百万），billion（十亿）等前面即使有具体的数词，several, some, many也不能在它们的后面加-s。
如：six hundred，eight million。
如果表示不确定数目时，用hundreds of /thousands of /millions of /billions of +名词复数,前面不能再加数字。
7）1000以上的数字，从后往前数每三位加一个逗号"，"第一个逗号前为千（thousand），第二个逗号前为百万（million），第三个逗号前为billion（十亿）。
英语中无“万”这个词，我们可以用"几十个千（thousand）"表示几万，"几百个千（thousand）"表示"几十万"。
(完整)小升初英语数词专题复习
数词专题复习1.March is month of the year.A: a three B: the third C: a third2.The class begins at (8:05).A: five to eight B: eight five C: five eight3.Eight plus eight is .A: sixteen B: sixty-four C: one4.He is an boy.A: eight years B: eight-year-old C: eight-years-old5.The wall is .A: four meters long B: four meter long C: four-meter long6.He lives in .A: 310 room B: room 310 C: Room 3107.This is my time to play the piano.A: at second B: two C: second8.The Day of the week is Sundaly.A: first B: one C: oneth9.There are days in a year.A: three hundreds sixty-five B: three hundred and sixty-five C: three hundred and sixty five 10.Jack is in .A:Three Clas, One Grade B: Class Three, Grade One C: Grade One, Class Three 11.Please turn to .A:Page Two B: Page second12.There are months in a year. December is the month of the year..A: twelve twelve B: twelve twelfth C: twelfth twelve13.Snow was born .A: on March 16th 1998 B: on March 1998,16th C: on 1998,March 16th14.What’s the date today? It’s .A: friday B: cloudy C: June 4th15.There are minutes in an hour.A: sixty B: sixtieth C: sixteen D:six16.This road is kilometers long.A: three hundred and ninety two B: three hundreds and ninety twoC: three hundred and ninety-two D:three hundreds and ninety-two17.“How many teachers are there in your university?”“.”A:Two hundreds and forty-three B: Two hundred and forty-thirdC:Two hundreds and forty-third D:Two hundred and forty-three18.There are English books for us students in the school library.A:four hundreds and five B:four hundreds fiveC:four hundred and five D:four hundred five19.“456” must be read and written in English as .A:four, five and six B: four hundred and fifty sixC:three hundreds and fifty-six D:four hundred and fifty-six20.There are students in their school.A:three hundreds and forty-five B: three hundreds of forty-fiveC:three hundred and forty-five D:three hundreds and fourty-five21.We have learned English words since last April.A:two hundreds and forty-five B: two hundred and forty fiveC:two hundred forty-five D:two hundred and forty-five22.May 23 reads .A:May the twenty-third B: the twenty-third MayC:May the twenty-three D:the twenty-three of May23.By the end of 1993, the peasants had planted trees in theirvilla.A:two hundreds of B: hundred ofC:two hundreds D:hundreds of24.is Teachers’ Day in China.A:Tenth September B: Swptember the tenthC:The of September D:The September tenth25.Her daughter was born .A:on May 8,on 1986 B: on May 8,1986C:in May 8,in 1986 D:in May 8,198626.I am in .A:Grade 1 Class 3 B: Class 3,Grade 1C:3 Class,1 Grade D:Class 3 Grade 127.children watched the monkey playing with each other in the zoo.A:About two hundreds B: Hundreds ofC:About two hundred of D:Hundred of28.There are nearly two students in our school now.A:thousands B: thousands ofC:thousand D:thousand of29.It’s from my home to the cinema.A:ten minutes’ walk B: ten minutes’ walksC:ten minute’s walk D:ten minutes walk30.Now computers can work times faster.A:a million of B: millions ofC:million D:millions31.There are about soldiers on the playground.A:two hundreds of B: two hundredC:two hundreds D:two hundred of32.Tom lives on floor .He doesn’t have a lift to go up and down.A:nine B: the ninthC:ninth D:a ninth33.4509 is read as .A:four thousand and five hundred nine B:four thousand,five hundred and nineC:four thousand,five hundred nine D:four thousands and five hundred and nine356.34.Mary spent dallars on the coat.A:four hundred sixty eight B:four hundred sixty-eightC:four hundred and sixty eight D:four hundred and sixty-eight35.trees are planted on the hill.A:Thousand B:ThousandsC:Thousand of D:Thousands of36.class begins at eight in the morning.A:One B:The one C:First D:The first37.They usually have supper at in the evening.A:twenty to eight B:twenty-eightC:twenty eight D:eight-twenty38.Mike and Bill are both in .A:3 Grades B:3 GradeC:grade 3 D:Grade 339.Your seat is in .A:Row nine B:the nine rowC:the ninth row D:the nineth row40.It took him hours to finish the work.A:one and a half B:one and halfC:half past one D:a half and one41.We’re going to learn today.A:Eleventh Lesson B:Lesson EleventhC:Lesson Eleven D:the Lesson Eleven42.The girl won the race.A:100-metres B:100-metreC:100 metres D:100 metre填空：1.There are (365) days in a year.2.September is the month of the year.3. There are forty-six students in Clsss (三班).4. December is the and last month of the year.5. Ann received a lot of presents on her birthday. The twelve-year-old girl felt very happy.6.There are students in our class, twenty boys and twenty girls.7. Our teacher often tells us that work must come .。
小升初英语总复习第二章词类第三节数词
4. 几十几的表示方法 基数词由十位数词后面加上个位数词合成，中
间加上连字符“-”；序数词则是在基数词的基础上， 十位数不变，只将个位变为序数词即可。
如：twenty-one(21)—twenty-first(21st)， ninety-five(95)—ninety-fifth(95th)
如： Two hundred of the students will plant trees this
Saturday. 这周六这些学生中有200名学生将去植树。
Hundreds of people attended the concert. 成百上千的人
们出席了音乐会。
Thousands upon thousands of English words come from
如：表示年龄：I'm 15 (years old). 表示身高：I'm 156 cm (tall). 表示体重：I'm 49 kg. 表示物品的价格：—How much is the meat？
—It's 20 yuan a kilo.
6. 表示数学运算时，用基数词。 如： 4＋6＝10 Four and / plus six is ten. 9－6＝3 Nine minus six is three. 2×7＝14 Two times seven is fourteen. 15÷5＝3 Fifteen divided by five is three. 7. 表示顺序时，用序数词。 如： The first boy in the line is Mike.
第二章 词 类
第三节 数 词
【通用版】小升初英语复习：词汇-考点解读英语专项训练-数词
数词一、用英文写出下列数字。
9_________ 11_________ 15_________ 19_________5_________ 90_________ 115_________ 200_________二．用英语填入适当的数字。
five +seven=_________six+_________=tenfive +six =__________________-five=fourten +ten =_________三．英译汉。
fifteen to eleven_____________________the third day____________________On March 20th, 2009____________________at half past seven____________________No. 5 Primary School____________________Two pieces of paper____________________四．选择填空1,Summer is ________season of the year.A secondB a secondC the second2.What time is it ? It’s________(7:40)A twenty to eightB twenty to sevenC twenty past eight3.There are ________workers in this city.A seven hundred and twenty sixB seven hundred twenty- sixC seven hundred and twenty- six4.Christmas Day is on ________A January 1stB December 25thC May 5th5.Thursday is ________ day of the week.A the fivethB fiveC the fifth6.________ It’s July 2nd.A What’s the day today?B What ‘s the date today ?C What day is today?7.The bike cost me ________ yuan.A five hundred fortyB five hundred fourtyC five hundred and forty8.She was born on ________A 1986, March 9B March 9, 1986C 1986,9, March9.Li Ming’s father was dead in his ________A thirtiethB thirtyC thirties10.My telephone number is________A eighty sight two forty four zero nineB eight eight two double four zero nineC eighty eight two four four zero ninety四．写出下列对应的序数词。
小升初英语数词专项复习资料
小升初英语数词专项复习资料表示数目多少或顺序多少的词叫数词，数词分为基数词和序数词。
表示数目多少的数词叫基数词;表示顺序的数词叫序数词。
1)基数词写法和读法：345 three hundred and forty-five;2)基数词一般是单数形式，但以下情况，常用复数：a. 与of 短语连用，表示概数，不能与详细数目连用，如scores of people 指许多人;b. 在一些表示;一排;或;一组;的词组里;如：They arrived in twos and threes. 他们三三两两的到达了。
c. 表示;几十岁;d. 表示;年代，用 in +the +数词复数;e. 在乘法运算的一种表示法里，如：3 x 5 = 15 Three fives is fifteen.序数词的缩写形式： first---1st second---2nd thirty-first---31st1)倍数表示法a. 主语+谓语+倍数+ as + adj. + asI have three times as many as you. 我有你三倍那么多。
b. 主语+谓语+倍数+ the size of…The earth is 49 times the size of the moon. 地球是月球的49倍。
c. 主语+谓语+倍数+ 形容词比拟级+ than…The grain output is 8 percent higher this year thanthat of last year.今年比去年粮食产量增加8%。
d. 还可以用by+倍数，表示增加多少倍The production of grain has been increased by four times this year.今年粮食产量增加了4倍。
2)分数表示法构成：基数词代表分子，序数词代表分母。
分子大于1时，分子的序数词用单数，分母序数词用复数：1/3 one-third ; 3/37 three and three-sevenths.这就是为大家分享的英语语法数词知识点，怎么样？满意吗？希望能够切实的帮助到大家，同时希望大家能够认真学习，加油哦~。
小升初英语分类专题复习——数词
小升初英语分类专题复习——数词一、数词数词有基数词和序数词两类。
基数词表示数量的大小，如one, two, three, four等。
序数词表示顺序，如first, second, third, fourth等。
数词与不定代词、冠词、指示代词、形容词性物主代词等被称作限定词。
二、基数词的表示法1.以下是最基本的基数词2. 21—99 的表示法。
先说“几十”，再说“几”，中间加连字号：twenty-one (21), thirty-six (36), forty-five (45), ninety-nine (99)等。
3. 101—999的表示法。
先说“几百”，后接and，再加末尾两位数(或末位数)：one hundred and one (101), five hundred and thirty (530), seventy hundred and eighty-nine (789)三、序数词的表示法100以内序数词的写法:1. 英语序数词1～19 除第一（first）, 第二（second）,第三（third）以外，其余均在基数词后加th构成。
2. 有几个序数词加th时拼法不规则：five是将ve改成f 后加th ;eight以t结尾加h ; nine以不发音的e结尾，去e加th 。
3.十位整数的序数词的构成方法：先将十位整数基数词词尾y变i，再加eth .4. 基数词“几十几”变成序数词时，仅将个位数变成序数词，十位数不变。
如：twenty –one → twenty – first5. 序数词的缩写形式，由阿拉伯数加上序数词的最后两个字母构成。
如：1st, 2nd , 3rd, 4th, 5th6. 序数词在使用时前面一定要加the 。
7. 以下是最基本的序数词，学习者必须牢记：四、月份，星期的表示法1.月份2．星期五、年，季节，月，日的表示法1.年代的表示法（年代前用in）：如：in 1987（in nineteen eight-seven），in 2009( in two thousand and nine)2.季节的表示法（季节前加in ）如：in spring , in summer , in autumn , in winter3.月份的表示法：月份开头首字母要大写，表示在某月用in。
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小升初英语数词相关复习资料英语数词定义和特征1、表示"多少"和"第几"的词，叫做数词(numeral)。
2、数词与不定代词相似，其用法或者相当于形容词，或者相当于名词。
种类1、基数词表示"多少"的词叫做基数词(cardinal numeral)，如：one (一)，twenty(二十)，hundred(百)等。
2、序数词表示"第几"的词叫做序数词(ordinal numeral)，如：first (第一)，twentieth (第二十)，hundredth(第一百)等。
基数词100以下的基本的墓数词1 one[wQn] 11 eleven[i5levn]2 two[tu:] 12 twelve[twelv]3 three[Wri:] 13 thirteen [5We:5ti:n]4 four[fC:] 14 fourteen5 five [faiv] 15 fifteen [5fif5ti:n]6 six[siks] 16 sixteen7 seven [5sevn] 17 seventeen8 eight [eit] 18 eighteen[5ei5ti:n]9 nine[nain] 19 nineteen10 ten[ten] 20 twenty [5twenti]21 twenty-one [5twenti5wQn] 60 sixty30 thirty [5WE:ti] 70 seventy40 forty [5fC:ti] 80 eighty50 fifty[5fifti] 90 ninety说明：1、13-19皆以后缀-teen[5ti:n]结尾，它们都有两个重音。
注意thirteen，fifteen，eighteen 的发音和拼法。
2、20-90第十位数的整数均以后缀-ty[ti]结尾。
3、十位数和个位数之间须用连字号"-"。
如：twenty-one(二十一)，fifty-five(五十五)，ninety-nine(九十九)等。
100以上的基本的基数词100 hundred [5hQndrid]1,000 thousand [5WauzEnd]1,000,000 million [5niljEn]百万100,000,000 hundred million 一亿1,000 million (=billion)十亿499 four hundred and ninety-nine(101-999如此构成)3,876 three thousand eight hundred and seventy-six (1001-9999皆如此构成)57,453 fifty-seven thousand four hundred and fifty-three(10001-99999)皆如此构成) 768, 921 seven hundred sixty-eight thousand nine hundred and twenty-one8,641, 457 eight million six hundred forty-one thousand four hundred and fifty-seven 50, 000, 000 fifty million500, 000, 000 five hundred million5, 000, 000, 000 five thousand million(或five billion)50, 000, 000, 000 fifty thousand million (或fifty billion)说明：1)100和100以上的基数词须用hundred，thousand，million, billion等。
2)十位数与百位数之间有and。
但也有不用and的情况，如850可以读作eight hundred fifty。
基数词的用法基数词在句中可用作下列句子成分：1、主语Two plus nine is eleven.二加九等于十一。
Four times six is twenty-four. 四乘六得二十四。
Three of them went to college last year.他们当中去年有三人上大学了。
(如说the three of them，意思则是"他们三个人")2、宾语Give me two.给我两个。
3、定语There are nineteen students in our class.我们班有十九个同学。
My uncle bought two hand tractors recently.我叔叔最近买了两台手扶拖拉机。
(注)hundred(百)，thousand(千)和million(百万)作定语用时一律不用复数；作名词用(后面多跟of短语)时则用复数。
如：Our country has a population of l,200 million people.我国有十二亿人口。
There are three thousand students in the university.这所大学有三千学生。
Rice has been cultivated in the East for thousands of years.水稻在东方已经种植了几千年。
Maize is the most important food crop for millions of people in the world.玉米是全世界千百万人最主要的粮食。
4、表语She is just fourteen.她刚十四岁。
He was already forty when he began to learn English他开始学英语时已经四十岁了。
序数词1－99的基本的序数词序数词缩写式汉译first [fE:st] lst 第一second [5sekEnd] 2nd 第二third [We:d] 3rd 第三fouth [fC:W] 4th 第四fifth[fifW] 5th 第五sixth[siksW] 6th 第六seventh[5sevenW] 7th 第七eighth[eitW] 8th 第八ninth[nainW] 9th 第九tenth[tenW] 10th 第十eleventh 11th 第十一twelfth[twelfW] 12th 第十二thirteenth 13th 第十三nineteenth 19th 第十九twentieth [5twentiiW] 20th 第二十fortieth 40th 第四十fifty-first 51st 第五十一sixty-second 62nd 第六十二eighty-third 83rd 第八十三ninety-fourth 94th 第九十四说明：1、英语序数词1-19除第一(first)，第二(second)，第三(third)有特殊形式外，其余均由基数词后加-th [W]构成。
2、有几个序数词加 -th 时拼法不规则，它们是：fifth，eighth，ninth，twelfth。
3、十位整数的序数词的构成方法是：先将十位整数基数词的词尾 -ty 中的y变成i，然后加-eth [iW]。
4、基数词"几十几"变成序数词时，仅将个位数变成序数词，十位数不变。
如twenty-one变成twenty-first。
5、序数词的缩写形式，由阿拉伯数码后加上序数词的最后两个字母构成。
如：1st，2nd，3rd，4th，31st，82nd，93rd，94th等。
序数词的用法序数词在句中可用作下列各个句子成分：1、主语The first is better than the second.第一个比第二个要好。
2、宾语He was among the first to arrive.他是首批到达的。
3、定语China exploded its first atom bomb in October 1964.中国于1964年10月爆炸了第一颗原子弹。
His father died in the Second World War.他父亲在第二次世界大战中死去。
4、表语Jack is always the first to get to the office in the morning.杰克每天早晨总是第一个到办公室。
[注]序数词前面常用定冠词the。
分数和小数的读法1、分数(fraction)分子为基数词，分母为序数词并有复数。
1／2 one half [hB:f]； 1／3 one-third； 2／3 two-thirds；1／4 one-fourth或 one quarter [5kwC:tE]； 3／4 three-fourths或 three quarters； 2 3/5 two and three-fifths.2、小数(decimal)0.5 zero [5ziErEu] point five； 1.25 one point two five； 3.458 three point four five eight.。