八年级英语数词讲解例题解析
在我们平凡的学生生涯里，是不是经常追着老师要英语数词知识点？英语数词知识点就是学习英语的重点。想要一份整理好的英语数词知识点吗？下面是小编帮大家整理的八年级英语数词讲解例题解析知识点，仅供参考，大家一起来看看吧。
八年级英语数词讲解例题解析知识点 1
数 词
英语数词表示数目或者顺序， 可分为基数词和序数词。基数词表示数量，序数词表示顺序。
知识梳理：提纲挈领，抓住重点和难点!
一、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-eight 406-four hundred and six。
6.hundred(百)，thousand(千)，million(百万)，billion(十亿)等前面即使有具体的数词，也不能在它们的后面加s。如：600-six hundred，8百万-eight million。
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"。如：2，510=two thousand five hundred and ten;84，296=eight-four thousand two hundred and ninety-six;274，350=two hundred and seventy-four thousand three hundred and fifty。
二、序数词的构成
序数词一般是以与之相应的基数词尾加-th构成，例如 fourth, tenth,但以下的这些基数词变为序数词时， 有特别之处。
1.one--- first, two --- second, three --- third, five --- fifth, nice --- ninth, twelve --- twelfth
2. 以ty 结尾的单词， 要先变y为I, 在加-eth. 例如：thirty ---thirtieth, fifty ---fiftieth
3. 以one, two, three 等结尾的多位数词， 要将各位数变成序数词。 例如： twenty-one --- twenty-first, one hundred and one --- one hundred and first
注意： 序数词前常用定冠词， 有时还可以用不定冠词 a/an 则表示 "又一 "的意思。
例如：Mr Brown has a second car. 布朗先生另外还有一辆车。
He has tried a second time. 他又尝试了一次。
三、数词的应用
1.时刻的表示：小时、点钟、分钟、秒钟要用基数词。
①"几点钟"用基数词加o'clock。o'clock可省略。如： 5点钟-five(o'clock).
②"几点过几分 "，≤30分钟"用介词past。如： 7：05-five past seven;7：15-fifteen (a quarter)past seven;7：30-half past seven。
③"差几分几点"用介词"to"。如：7：40-twenty to eight;7：45-fifteen(a quarter to eight。
④日常生活中的时间读法常常简化，直接按基数词的顺序读。如：7：05-seven o five;7：15- seven fifteen。
2.年月日的表示：
① 年份用基数词，如：1999年-nineteen ninety-nine; 1900年-nineteen hundred; 2000-two thousand;1905-nineteen o five;
② 年用基数词，日用序数词。如：1998年6月8日 写作：June 8，1998;读作：June the eighth， nineteen ninety-eight或the eighth of June， nineteen ninety-eight。
3. 世纪、年代表示法：
(在)90年代 (in) the nineties
(在)19世纪 (in) the nineteenth century
(在)18世纪30年代 (in) 1730s或1730's
4.编号的表示：
① Lesson One =the first lesson第一课;
② Bus No.3=the No.3bus 3路公共汽车;
③ 表示住所时不用"No."如：302房间-Room 302(读作：room three o two);
④ 如果编号的数词比较长，一般用基数词。如：Page 457第457页;
⑤ 电话号码，用基数词,如：3855633-three eight five five(double five) six three three(double three)。
5.分数的表达：
分子用基数词，分母用序数词，分子大于"1"，分母则加"s"。如：1/3 one third，2/3two thirds;
另外：1/2 a(one)half; 1/4one fourth或a(one)quarter;3/4threefourths或three quarters。
half a second; a quarter of a second四分之一秒
6. 表示有小数的词用基数词。
5.5 five point five
12.135 twelve point one three five
7.表示百分数
5℅：five percent (per cent)， 0.8℅ zero point eight percent (per cent).
8.表示有小数的词用基数词。
5.5 five point five
12.135 twelve point one three five
9.其他用法：
1)基数词+单数名词+形容词构成合成形容词。如：一个五岁的男孩a five-year-old boy;
一座800米长的桥an 800-metre-long bridge;女子400米接力girls'400-metre relay race。
2)具体数词+metre(s)/kilometre(s)/kilo(s)long / high /tall /deep /away等。如：长江长6300公里。The Changjiang River is 6，300 kilometres long.
3)表示"几十岁"用序数词，eg. 在他三十几岁时 in his thirties
4)倍数的表达：(一倍用once，两倍用 twice，两倍以上用基数词+times。如：5倍five times)。
例如：He is as tall a boy as I.
He is a head taller than I .
He is two years older than I
China is four times as large as Europe.
I am twice as old as you. (=I am twice older than you. /I am twice the age of you.)
My books are twice as many as yours.
China is four times larger than Europe.(=China is four times the size of Europe.)
I pay twice as much as it was worth.
I pay twice as much for the house.
例题解析：举一反三，学的更轻松!
1. _______ Chinese are looking for ways to learn English well before Beijing 2008 Olympic.
A. Thousand B. Thousands C. Thousand of D. Thousands of
2. Both of the rules are broken. I want to buy a ______ one.
A. three B. third C. forth D. /
3). --- Which is the smallest number of the four? --- _________.
A. Two- thirds B. A half C. A quarter D. Three-fourths
4). Please write down the new words in the text of _______.
A. Lesson Eleven B. the Lesson Eleven C. Lesson Eleventh
解析：1.基数词hundred, thousand, million, billion 等前有具体数字时，它们后面不能加s,若这些词后面有介词of (几百，成百上千) ，thousands of (几千，数千个)，millions of, billions of 前不可用数词修饰。但可用many, some, several 等修饰。故选答案D.
2.答案： B。此题主要考查序数词的运用。
3.答案：C。此题主要考查英语中的分数表示法。英语中表示分数时，分母用序数词，分子用基数词，当分子大于1时，表示分母的序数词后要加s.
4.答案： A。 此题主要考查基数词的编号。在通常情况下，名词编号有这几种表示法：
1）事物名词+基数词，且每个单词的首字母都要大写。如：Lesson Eleven;
2）定冠词+基数词+事物名词。如： No. 6 Middle School
练习与巩固：熟能生巧，取得好成绩!
选择填空：
1. _______ of people in the world are sending information by E-mail ever day.
A. Many million B. Several million C. Several millions D. Many millions
2. About _______ of the surface of the earth _______ covered with water.
A. three quarter, is B. three quarters, has C. three quarters, is D. three quarter, are
3. It will take _______ time to finish the work.
A. one and a half year's B. a year and half C. one and a half year's D. a year and half's
4.--- How long will your stay here ?
---For ________ .
A. one and two day's B. one and two day C. a day or two D. one or two day
5.When he moved to Germany in ______ , he was already in _______ .
A. the fifties; his sixties B. fifties; his sixties
C. the fifties; his sixty D. fifty; sixty
6.My brother lives in ______ on ______ floor.
A. six Room ;second B. Room six ;the second
C. Room six; two floor D. the room six ; the second
7.December is _______ month of the year.
A. twelve B. twelfth C. the twelfth D. the twelve
8.This took place in the ______ .
A. 1940 B. 1940s C. 1940es D. 1940th
9.It is only _____ from my home to the train station.
A. ten minutes walk B. ten-minutes walk C. ten minutes 's walk D. ten minutes' walk
10.There are ______ in this building , I live on ______.
A. nine floors ,the ninth floor B. nine floor, the ninth floor
C. nine floor , nine floors D.ninth floor,the ninth floor
11.The water behind the Three Gorges Dams (三峡大坝) should be ______ higher than downstream( 下游)。
A. sixty-five meter B. sixty-fifth meter
C. sixty-five meters D. sixty-fifth meters
12. There are _______ days in a year.
A. three hundred sixty-five B. three hundred and sixty-five
C. three hundred and sixty -five D. two hundreds and sixty-five
13. ---How many teachers are there in your school?
--- __________. , but I'm not sure.
A. Hundreds B. Hundred C. Hundreds of D. One hundred
14. There are _________ doctors and nurses working hard in that hospital.
A. thousand B. two thousand C. two thousands D. two thousands of
15. --- What's one fourth and a half, do you know?
--- Yes, it's _________.
A. two sixths B. three fourths C. one three D. three sixth
16. Now children, turn to page ________ and look at the _______ picture in Lesson Two.
A. twentieth, one B. twenty, one C. twentieth, first D. twenty, first
17. Both of the two rulers are broken. I want to buy a _______ one.
A. three B. third C. forth D. /
18. December is the __________ month in year.
A. twenty B. twelve C. twentieth D. twelfth
19. --- What is the date today?
--- It's _________.
A. Thursday B. June the sixteenth C. the best day D. June fifteen
20. She knows a lot about China as she has been to China ________.
A. for the forth time B. four times C. a fourth time D. for four times
1-5 CCACA 6-10 BCBD 11-15 CCCDA 16 -20 DBDBB
八年级英语数词讲解例题解析知识点 2
1.数词的种类数词分基数词和序数词
基数词是表示自然数列的词,例如;one,two,three,four…..
序数词是表示先后顺序的词,例如:first,second,third,fourth…
2.基数词和序数词的表示法
(1).基数词单词的拼写：1~12为单词，13~19都以后缀-teen结尾，20至90这样的整十数都以后缀-ty结尾，其他基数词中间加连字符号“-”再按照上述的变化进行。
例：21→twenty-one56--fifty-six85→eighty-five
三位数的构成为：几+百+and+末两位(或末一位)数
例：132→onehundredandthirty-two
205→twohundredandfive
千以上的数字的读法：从后面往前，每三位数作为一个单位，分别为thousand,million.
32,548,652,读作：thirtytwomillion,fivehundredandfortyeightthousand,sixhundredandfiftytwo
(2.)序数词=基数词+th(1、2、3为first,second,third)。但以下情况要注意：
1)fifth(第五)，eighth(第八)，ninth(第九)，twelfth(第十二)
2)以ty结尾的基数词变词尾为tieth
例：twenty→twentieth,ninety→ninetieth
3)复合序数词只需要将相应基数词中最后一位变成序数词，其余不变。
例：第二十一→twenty-first
第二百四十五→twohundredandforty-fifth
基数词序数词的用法
1.hundred,thousand,million与数字连用，表示一定量的'具体数字，不用复数，但表示不定概念可用复数
例：threehundredpeople,millionsofpeople
2.基数词表示时刻。五年级英语语法知识点
例：7点seveno'clock,7:20seventwenty
3.给某些事物编号
例：LessonOne=thefirstlesson
BusNo.2 7月1日=JulyI(JulyIst)
1996年6月3日=June3,1996=Junethethird,nineteenninety-six
4.有关分数表示法。分子是基数词，分母是序数词。当分子大于1时，分母就用复数。
例：I'vereadone-fifthofthebooks.
I'vefinishedthree-fifthsofthewords.
八年级英语数词讲解例题解析知识点 3
知识要点
表示“多少”和“第几”的词，叫数词。数词分为基数词和序数词两种。
基数词：在十位数词和个位数词中间加上连字符 “ - “ 。如： 21 twenty -one'基数词三位以上的数词， 在百位和十位之间，一般要用连词"and “。 如： 132 one hundred and thirty-two.
表示”万“的词英语中没有。如1万可用10千来表示。 ten thousand. 30万可用 three hundred thousand 来表示。
基数词的用法：
1.编号的事物用基数词： 如：Lesson Five， Room 101
2.表示”年，月，日“ 时用基数词。
3.表示 “几点钟， 几点过几分” 用基数词。 It is two to two. 现在是两点差两分。
4.加减乘除用基数词。 One plus two is three.一加二等于三。Eight minus four is four. 八减四等于四。
Two times two is four.二乘二等于四.Ten divided by two is five.十除二等于五。
5表示百分数用基数词.
Thirty percent of them is water. 它们当中有30%的水。
6.表示分数时，分子数字用基数词， 但分母要用序数词， 如分子不是1，序数词要用复数形式。
One-fifth of the books are mine. 三分之一的书是我的。
Three-tenths of water is disappeared. 十分之三的水不见了。
2)序数词：表示数目顺序的词用序数词。
1.序数词1━19 除第一，第二，第三，第五，第八，第九， 第十二变化不规则外， 其余均由在基数词后加上 -th。
2.十位整数的序数词的构成方法是， 是将十位整数基数词的词尾 -y 变成 i 再加 -eth。
3.几十几的序数词，只是把个位数变成序数词， 十位数不变。
4.第一百以上的多位序数词 由基数词的形式变结尾部分为序数词形式来表示。
one hundred and twenty-first ，one thousand，three hundred and twentieth
5.序数词的缩写形式 有时，序数词可以用缩写形式来表示。主要缩写形式有。
first--lst second--2nd third--3rd fourth--4th sixth--6th twentieth--20th twenty-third--23rd 其中lst，2nd，3rd为特殊形式，其它的都是阿拉伯数字后加上th。
6.通常前面要加定冠词 the;但是如果序数词前出现不定冠词a或an时，则表示“再”，“又”.
We've tried it three times.Must we try it a fourth time?
7.基数词也可以表示顺序。只需将基数词放在它所修饰的名词之后(名词需大写) 即可，不需要添加定冠词。
the first lesson-Lesson One ，the fifth page-Page 5， the twenty-first room-Room 21
练习
1. I've read ______ sports news about the F1 race today.
A. two B. pieces C. two pieces D. two pieces of
2. During World War II， a Jewish(犹太)lady was protected by a local family in Shanghai in her ______.
A. fifties B. fifty C. fiftieth D. the fiftieth
3. The river through our city， which is about _________， is clean again.
A. 6000 meters long B. 6000-metres-long
C. 6000-metre-long D. 6000 meter long
4. I study in Yu Cai Middle School. There are two ____students in our school.
A. thousand B. thousands C. thousand of D. thousands of
5. They said they would have holiday.
A. a two-month B. two months C. two-months D. two-month's
6.-When was the PLA founded?
-It was founded on ____.
A. July 1. 1921 B. October 1.1949
C. May 1.1922 D. August 1.1927
7. In the past two years， many tall buildings have been built in our city. The tallest is an that stands in the centre.
A. 80-floor building B. 60-floor building
C. 80-floor buildings D. 70 floors building
8.The number of people invited ____ fifty， but a number of them _____absent for different reasons.
A. were ; was B. was ; was C. was ; were D. were ; were
9.- How soon will you finish your work? -In about _______.
A. one and a half month B. one month and a half
C. one and half a month D. a month and half
10.-Would you like some fruit， madam? -Oh， yes. _______， please.
A. 5 kilo bananas B. 5 kilos of bananas
C. 5 kilo of bananas D. 5 kilos of banana
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