Unit2Amazingnumbers主題范疇：人與社會主題群：歷史、社會與文化；科學與技術子主題：對世界、國家、人民和社會進步有突出貢獻的人物；科學技術與工程，人類發(fā)明與創(chuàng)新KeyquestionWhatistheroleofnumbersinourdailylives?mastertherulesofusingcardinalnumbersandordinalnumbers;

givecorrectinstructionsaboutnumbers.Learningobjectives學習目標Attheendoftheclass,I’llbeableto:1.Thenumberofstudentsinourclassis40.

2.I’dlikeonegrainofriceforthe

firstsquareofthechessboard,…3.Itisworththreehundred.4.Thelittleboywasbornin11

Dec.2018.5.MoYanwontheNobelPrizeforLiteraturein

2012.6.Whoisthewoman,thesecondinthe

secondline?HavealookACardinalnumbers1.Theconceptofcardinalnumbers2.Theformationofcardinalnumbers3.TheusageofcardinalnumbersSection2ExploringandapplyingrulesTheconceptofcardinalnumbers

Weusecardinalnumberstocountthings.1.Peoplefromabout180

countriesandareasliveinNewYork.2.TheCNToweris1,815feettall.3.RedSquareinMoscowisabout91,000square

metresinsize.4.Francehasanareaofover26,000squaremiles.5.Thereareabout8,000,000peoplelivinginLondon.6.Tokyo,thecapitalofJapan,hasover13,000,000

people.0～12為基本單詞：zero

one

two

three

four

fivesix

seven

eight

nine

ten

eleventwelve13～19為對應的個位數單詞（或變形）后加-teen：thirteen

fourteenfifteen

sixteenseventeen

eighteennineteen3three13thirteen11eleven15fifteen12twelve18eighteenTheformationofcardinalnumbers

20～90為其對應個位數單詞（或變形）后加-ty：twenty

thirty

forty

fifty

sixty

seventyeighty

ninety26twenty-six 99ninety-nine

Whenwesaythirteen,westressthesecondsyllable.Whenwesaythirty,westressthefirstsyllable.20twenty70seventy30thirty82eighty-two50fifty98ninety-eight100onehundred200twohundred375threehundredandseventy-five101～999的三位數，百位數和十位數（若無十位數則和個位數）之間用and連接，百后用單數形式：103 a/onehundredandthree225 twohundredandtwenty-five

999 ninehundredandninety-nine多位數：注意每三個數為一個單位，按照百、十、個向下讀。6,500,431,729billionmillionthousandsevenhundredandtwenty-ninesixbillion,fivehundredmillion,fourhundredandthirty-onethousand,在英語中，對于萬以上的數字，我們該如何表達呢？這就要記住英語數字讀法特點。以下面一個數字為例：

Let’ssumuptherules!Whenwereadoutnumbers,wedonotadd-stothewordshundred,_________,_________,and__________.Weput________betweenhundredandten.thousandmillionbillionand表示數量：onebook(一本書)；threeapples(三個蘋果)。表示時刻、年份、年代：nineo’clock(九點鐘)；intwothousandandtwenty(在2020年)；inthe1960s(在20世紀60年代)。表示年齡：Heisten(yearsold).(他十歲了)；inone’sthirties(在某人三十幾歲時)。表示事物編號：Room105(105房間)；LessonOne(第一課)；BusNo.10(10路公共汽車)。表示電話號碼：Phonenumber6225371(電話號碼6225371)。數學運算：Twoandthreeisfive.(二加三等于五)。Theusageofcardinalnumbers

1)hundred,thousand,million,billion這些詞前面若有表示具體數字的詞時，它們不能加“s”，反之要加“s”，并與of短語連用。threethousandpeoplethousandsofpeople2)年份用基數詞表示，分兩位一讀，年份前面用介詞in。在1999年innineteenninety-nineTips3)表示整十的基數詞用復數形式可以表示人的大約歲數或年代。在他二十歲出頭時

在20世紀30年代inhisearlytwentiesinthe1930s讀作

inthenineteenthirties

4,056=fourthousandandfifty-six23,813=twenty-threethousandeighthundredandthirteen567,110=fivehundredandsixty-seventhousandonehundredandten6,425,200=sixmillionfourhundredandtwenty-fivethousandtwohundredHowdowesaythefollowingnumbers?PracticeBOrdinalnumbers1.Theconceptofordinalnumbers2.Theformationofordinalnumbers3.TheusageofordinalnumbersWeuseordinalnumberstoshowtheorderofthings.?Women’sDayisontheeighthofMarch.?Ourflatisontheseventhfloor.?Heisalwaysthefirsttocometotheschoolinourclass.Theconceptofordinalnumbers

1)一般來說，是由相應的基數詞加詞尾th構成。

four+th

seven+th

ten+th2)有些基數詞在變?yōu)樾驍翟~時，有特殊的變化。

one

two

three

five

eight

nine

twelve

→fourth→seventh→tenth→first→third→eighth→twelfth→second→fifth→ninthTheformationofordinalnumbers

3)十位整數序數詞的構成方法是將基數詞的詞尾y變成i，然后再加eth。

twenty

thirty→twentieth→thirtieth

twenty-one

thirty-five

ahundredandfifty-three4)兩位或兩位以上的基數詞變成序數詞時，僅將個位數變成序數詞?！鷗wenty-first→thirty-fifth

→ahundredandfifty-third

forty

ninety→fortieth→ninetiethLearnthenumbersandfindouttherules.Workouttherule-th基變序，有規(guī)律，詞尾加上th。一二三特殊記，詞尾字母t,d,d。八加h，九減e，ve要用f替。ty要變tie，然后再加th。若是遇上幾十幾，只變個位就可以。Theusageofordinalnumbers

1)序數詞前面通常要加定冠詞the，但當序數詞作定語修飾名詞且前面有形容詞性物主代詞或名詞所有格時，the可以省略。?Takethe

firstright.

?My

first

teacher

?Lily’s

thirdbook

我的第一個老師莉莉的第三本書在第一個路口向右拐。Tips2)日期可以用基數詞或序數詞來表示。讀時前面要加定冠詞the，日期前面要用介詞on。在6月1日

3)編號可以用基數詞或序數詞來表示。序數詞位于名詞之前，前面要加定冠詞the，而基數詞位于名詞之后，且名詞和基數詞的首字母都要大寫。thesecondpart=PartTwoonJune1/

onJune1st讀作

onJunethefirstInstructionsaboutnumbersCanyougivecorrectinstructionsaboutaddition(加法),subtraction(減法),multiplication(乘法)anddivision(除法)?

3+99-33×99÷3Add3and9.Subtract3from9.Multiply3by9.Divide9by3.用英語描述算式時，多用祈使句。這些祈使句由表示加、減、乘、除的動詞開頭，但要注意每個動詞各自的搭配習慣。TableILook&Learn

上述幾個結構中的3plus9，9multipliedby3等作主語，要把它們看成是一個整體，謂語動詞要用單數形式is或equals。TableII3+9=129-3=63×9=279÷3=33plus9equals/is12.9minus3equals/is6.3multipliedby9equals/is27.9dividedby3equals/is3.Plusandminusareprepositions.祈使句“主一系一表”結構加(A+B)AddAandB.AplusBequals/is(A+B).減(A-B)SubtractBfromA.AminusBequals/is(A-B).乘(A×B)MultiplyAbyB.AmultipliedbyBequals/is(A×B).除(A÷B)DivideAbyB.AdividedbyBequals/is(A÷B).Inpairs,completethesentenceslikethoseinTableIandTableII.1

S1:A

11

1.

S2:

p

equals/is

.()2

S1:S

5

13.

S2:

m

equals/is

.()3

S1:M

7

8.

S2:

m

by

equals/is

.()andubtractfrom13inus5813-5=8ultiplyby7ultiplied8567x8=56dd11lus11211+1=124S1:D

16

4.

S2:

d

by

equals/is

.()5S1:A

9

6.

S2:

p

equals/is

.()6S1:A

14and4andd

theanswerby2.

S2:

p

andd

theanswerby

equals/is

.()ivideby16ivided4416÷4=4ddand9lus6159+6=15ddivide14lus4ivide29(14+4)÷2=9Add6and8.6plus8is/equals14.Usethenumbersfromthecharttogiveinstructionsaboutnumbers.基數詞表示數量的多少，常用來談論數目、時間等，如：elevenmiles，nineo’clock等。序數詞表示事物的順序，常用來談論日期、樓層、位置等，如：on10thMay等。數字運算:Practice1Lookattheinformationaboutthethreelongestriversintheworld.Taketurnsaskingandansweringquestionsabouttherivers.S1:Whichisthefirst-longestriverintheworld?Whereisit?Howlongisit?S2:TheNileRiveristhefirst-longestriver:it’sinAfrica.it’sabout6,671kmlong.TheNileRiverAfrica6,671kmTheAmazonRiverSouthAmerica6,480kmTheYangtzeRiverAsia6,300km2LookatthelistofthehighestmountainsinAsia,NorthAmericaandAfrica.Describethemountainswithcardinalandordinalnumbers.RankNameHeightContinent1Mt.Qomolangma8,848.86mAsia2Mt.Qogir8,611mAsia3Mt.Kanchenjunga8,586mAsiaThetallestmountainin...is...Itis...metreshigh....isthesecond-highestmountainin...RankNameHeightContinent1Mt.Denali6,190mNorthAmerica2Mt.Logan5,959mNorthAmerica3PicodeOrizaba5,610mNorthAmericaThetallestmountainin...is...Itis...metreshigh....isthesecond-highestmountainin...RankNameHeightContinent1Mt.Kilimanjaro5,895mAfrica2Mt.Kenya5,199mAfrica3Mt.Stanley5,109mAfricaThetallestmountainin...is...Itis...metreshigh....isthesecond-highestmountainin...一、單項選擇(

)1.Lesson_____ison_____pageoftheChinese

book.

A.Six;thetwenty-fourth

B.Sixth;thetwenty-fourth

C.Six;twenty-four

D.Sixth;twenty-four(

)2.Thereare_____studentsinourschool.A.onethousandandthreehundredandfifty-one

B.onethousandthreehundredandfifty-one

C.onethousandthreehundredfifty-one

D.onethousandthreehundredfiftyoneAB(

)3.ThePalaceMuseumisafamousplaceinBeijing.

Everyday,_____people