小升初基数, 序数讲解及练习.doc

数词与序数一、 教学衔接2、 教学内容知识点一 基数词变序数词的规律：口诀：基变序，有规律。一、二、三、特殊记，词尾字母t,d,d. (如：first, second, third)。八减t,九去e,（如：eighth, ninth）, f 来把ve替。（如：twelfth）.单词ty作结尾，ty变成tie(如：twentieth).若是碰到几十几，只变个位就可以。（如：twenty-first）1-100的序数词：1st-first；2nd-second；3rd-third；4th-fourth；5th-fifth；6th-sixth；7th-seventh；8th-eighth；9th-ninth；10th-tenth；11th-eleventh；12th-twelfth；20th-twentieth；21st-twenty-first；22nd-twenty-second；29th-twenty-ninth；30th-thirtieth；31st-thirty-first；40th-fortieth；50th-fiftieth；60th-sixtieth；70th-seventieth；80th-eightieth；90th-ninetieth；100th-hundredth二、巩固练习：写出下列词的序数词形式。1. one 2.two 3. six 4.five 5. nine 6.twelve 7.eight 8.twenty-one 写出下列单词的基数词形式。1.third 2.fourth 3.tenth 4.twentieth 5.nineteenth 6.thirty-first _根据句子意思填空。1. Childrens Day（儿童节） is on the of June（六月）.2. There are months（月）in a year(年).3. Teachers Day(教师节) is on the of September（九月）.4. Three plus(加) six is .选择填空。( )1. My cousins birthday in on the of October. A. three B. first C. the second( )2. What date is it today? Its of April. A. twelfth B. the 12th C. 12th( )3. There are days in a week. A. the seven B. seventh C. the seventh D. seven( )4.Sunday is the day of a week. A. one B. first C. second( )5. Twenty-eight minus(减)six is . A. the twenty- second B. twenty-two C. twenty- second( )6. Four plus(加) is twelve. A. seven B. eight C. nine知识点二 基数词的构成及其说明1）112是独立的单词。即： one, two, three, four, five, six, seven, eight, nine, ten, eleven, twelve2)1319,多数在末尾加-teen,但应注意13、15、18的拼写形式。例如：13thirteen 14fourteen 15fifteen16sixteen 17seventeen 18eighteen 19nineteen3)从2090整十位数，多数在词尾加-ty，但要注意20、30、40、50和80的拼法。例如：20twenty 30thirty 40forty50fifty 60sixty 70seventy80eighty 90ninety4)2199是由几十和几合起来构成，中间加连字符（-）。例如：21twenty-one 32thirty-two 55fifty-five74seventy-four 86eighty-six 99ninety-nine5)101999等三位数中，十位数或个位数的前面加and。例如：101a(one)hundred and one230two hundred and thirty513five hundred and thirteen678six hundred and seventy999nine hundred and ninety-nine6)1,000以上的数，要用计数逗点，即从个位开始，每隔三位数加一逗点，第一个逗点处是thousand(千)，第二逗点处是million(百万)，第三个逗点处是thousand million(英)或billion(美)（十亿）。例如：一千1，000a(one)thousand 4,596four thousand five hundred and ninety-six一万10，000ten thousand 18,261eighteen thousand two hundred and sixty-one十万100，000a(one)hundred thousand 766,132seven hundred and sixty-six thousand one hundred and thirty-two一百万1，000，000a(one)million 4,538,536four million five hundred and thirty-eight thousand five hundred and thirty-six一千万10，000，000ten million一亿100，000，000a(one)hundred million十亿以上的数，英美说法不同。十亿10，000，000，000英国 a(one)thousand million美国 a(one)billion百亿10，000，000，000ten thousand million注意 汉语中有百、千、万、亿等单位，而英语中有hundred(百)，thousand(千)，million（百万）等，但没有表示万和亿的专门单词，要用十进位的方法推算出来。例如：thousand千百万 ten thousand万hundred thousand 十万million百万ten million千万hundred million亿（万万）巧学巧用读数的诀窍有一首歌诀，可以帮助我们迅速地用英语读出长数字。从右向左三逗开，一逗千，二逗百万，三逗就是十万万；左右三位分开读，保你又快又喜欢。“从右向左三逗开”，指从右向左把长数字母三位用逗号分开。如：10，000；225，430；51.000，000，000“一逗千，二逗百万，三逗就是十万万；”指从右向左的第一个逗号表示“千”（thousand）；第二逗号表示“百万”（million）；第三个逗号表示“十万万”（billion,即十亿）。“左右三位分开读，保你又快又喜欢。”指读数时从左向右，每三位三位地按三位数的读法读，遇到有逗号时就分别加上该逗号所表示的那个英语单词。2.hundred, thousand, million与of连用数词hundred, thousand, million等的前面有其他数词，用作确定的数目时，不用复数形式。例如：three thousand三千（不能说：three thousands）five hundred五百（不能说：five hundreds）但是当hundred, thousand, million在用作不确定的数目时，则需用复数形式，并且往往后接of。例如：hundreds of people几百人 hundreds of thousands of people几十万人millions of the locusts千百万只蝗虫巧学巧用有hundred等数词有s时有of, 没有s没of；数词前面加，没有s没of；前面无数词，有s也有of。 单项选择：1.The tree is _ tall. A. fourteen foots B. fourteen feet C. fourteen foot D. forty foot2.Fifty plus_. A. fourty is ninety B. forty is ninety C. thirty is ninety D. fifty is ninety3.There are_ students in this school.A. four hundred fifty-twoB. four hundreds fifty twoC. four hundred and fifty-twoD. four hundreds and fifty-two4.My home is about_ away from the school. A. three hundred metre B. three hundreds metres C. three hundred metres D. three hundred metre5.December is_ and last month in a year. A. the twelveth B. twelve C. the twelfth D. twelfth6._ of the teachers in the school are from colleges. A. Three quarters B. Two-third C. Two fifth D. Two-ninth7.There were two world wars during_ century. A. the twenties B. the twentieth C. twenties D. twentieth8.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; Eighth B. Four; Eighth C. Fourth; eight D. Fourth; eighth9.We are learning_ now. A. the twenty-first lesson B. Lesson Twenty-first C. the 21 th lesson D. Lesson 21 st10.He will stay here for_. A.one and half month B.one and a half month C.one months and a half D.one and a half months11.Whats the date today?Its_ . A .nine B. Monday C. June 5 D.11:0012.Would you like to eat_ apples? No, thank you. A. more two B. two more C .two another D. two else13.He said he would come back in_. A.one or two days B. o or two days C.one and two days D. a day and two14.How often do you write to your parents abroad? _ .A. Twice a month B. Second times a month C.A second time a month D. second a time a month15._people died in the traffic accidents in the wor