巧记英语序数词英语中的数词分为基数词和序数词，而基数词和序数词的的变化学生常出现错误，在教学过程中我总结了以下口诀，学生们用起来就简单多了，并且还不会出错。

基变续，有规律，词尾加上th;一二三，特殊记，词尾字母t,d,d(first,second,third);八减t(eighth), 九去e (ninth)，f来把ve替(five---fifth,twelve---twelfth);单词ty作结尾，ty变成tie(twenty-twentieth);若是碰到几十几，只变个位就可以(twenty-one----twenty-first).序数词表顺序，一般需用定冠词。

基数词和序数词的练习题一、写出下列词的序数词1. one2.two3.six 4.five 5.nine 6.twelve 7.eight 8.twenty-one二、写出下列单词的基数词1.third2.fourth3.tenth4.twentieth5.nineteenth6.thirty-first _三、根据句子意思填空。

1. Children’s Day（儿童节） is on the of June（六月）.2. There are months（月）in a year(年).3. Teacher’s Day(教师节) is on the of September（九月）.4. Three plus(加) six is .四、选择题( )1．There are ___________ days in a year．A．three hundred and sixty five B．three hundred and sixty-five C．three hundreds and sixty five D．three hundreds and sixty—five ( )2．Danny lives in __________．A．room 404 B．Room 404 C．404 room D．404 Room( )3．Jim is in __________．A．class one，grade six B．grade one，class sixC．Class One，Grade Six D．Grade One Class Six( )4．The bike cost me _________ yuan．A．five hundred forty B．five hundreds fourtyC．five hundred and forty D．five hundred fourty( )5．My telephone number is ____________．A．eighty eight two forty four zero nineB．eight eight two double four O nine( )C．eighty eight two forty-four zero nineD．eight eight two four four zero nine( )6．Is there any food for us _________?A．ten B．tenth C．the tenth D．the ten( )7．Mary is _________ girl．A. an 8 year old B．8一years—oldC．the 8 years old D．an 8一year—old( )8．—What day is today? — ___________A．June B．Tuesday C．It is hot D．It’s fine( )9．—What’s the date today? — ___________A．It’s Saturday B．It’s July C．It’s fine D．It’s JuIy 15( )10．—What time do you get up every day?A．It’s seven o’clock B．Seven o’clock timeC．At seven D．On seven一、单项选择( )1.The tree is tall.A. fourteen footsB. fourteen feetC. fourteen footD. forty foot( )2.Fifty plus .A. fourty is ninetyB. forty is ninetyC. thirty is ninetyD. fifty is ninety( )3.There are students in this school.A. four hundred fifty-twoB. four hundreds fifty twoC. four hundred and fifty-twoD. four hundreds and fifty-two( )4.My home is about away from the school.A. three hundred metreB. three hundreds metresC. three hundred metresD. three hundred metre( )5.December is and last month in a year.A.the twelvethB.twelveC.the twelfthD.twelfth( )6. of the teachers in the school are from colleges.A.Three quartersB.Two-thirdC.Two fifthD.Two-ninth( )7.There were two world wars during century.A.the twentiesB.the twentiethC.twentiesD.twentieth( )8.In the forties, his father served in the New Army(新四军)，while his mother worked in the Route Army(八路军).A. Fourth; EighthB.Four; EighthC.Fourth; eightD.Fourth; eighth( )9.We are learning now.A.the twenty-first lessonB.Lesson Twenty-firstC.the 21 th lessonD.Lesson 21 st( )10.He will stay here for .A.one and half monthB.one and a half monthC.one months and a halfD.one and a half months( )11.—What’s the date today?—It’s.A. nineB. MondayC. June 5D.11:00( )12.—Would you like to eat apples?—No, thank you.A.more twoB.two moreC.two anotherD.two else( )13.He said he would come back in .A.one or two daysB.o or two daysC.one and two daysD.a day and two ( )14.—How often do you write to your parents abroad?—.A.Twice a monthB.Second times a monthC.A second time a monthD.second a time a month( )15. people died in the traffic accidents in the world.A.Thousand ofB.Thousands ofC.Ten thousands ofD.Ten thousand of ( )16.In the 1850s, about was covered by forest in the USA.A.thirdB.a thirdC.the thirdD.a thirds( )17.This is her birthday, I think.A.twentyB.twentiethC.the twentiethD.the twenty’s( )18.September is Teachers’Day.A.the tenB.tenthC.the tenthD.the ten’s( )19.There are children in the country school.A.two thousand five hundred and sixtyB.two thousands five hundred and sixtyC.two thousands five hundreds and sixtyD.two thousand five hundreds and sixty( )20. of the soldiers is about two thousand.A. A numberB. The number ofC. A great numberD. The biggest numbers of。