沪教版(初中二年级)八年级英语第一学期(试用本)：Numbers课件

NumbersNumbers

AncientnumbersGreekEgyptian(希腊的;希腊人;希腊语)(埃及的;埃及人)AncientnumbersGreekEgyptianRomanⅠ=1Ⅴ=5Ⅹ=10L=50C=100D=500M=1000III=3，Ⅳ=4，Ⅵ=6，ⅩⅨ=19，ⅩⅩ=20，ⅩLⅤ=MCMⅩⅩC=198045RomanⅠ=1Ⅴ=5Ⅹ=10L=5Chinese壹贰叁肆伍陆柒捌玖拾佰仟万Chinese壹贰叁肆伍陆柒捌玖拾佰0Whoinventedthesenumbers?23456789

Whoinvented“zero”?Whywasitaveryimportantinvention?Indian

ArabiannumberItmadeiteasiertowritebignumbersandtocalculate.0Whoinventedthesenumbers?30%apercentagen.百分数,百分比60oanumbershowingdegreesn.度数,度,aprotractorapairofcompasses√

56squareroot平方根30%apercentagen.百分数,百分比60oaWhatarethese?adecimalnumberadj.小数的,n.小数0.824apairofoddnumberadj.奇数的,单数的,不成对的,5189afraction

n.分数56apairofevennumberadj.偶数的32158Whatarethese?adecimalnumb+add;plus-subtract,minusxmultiply,times÷

divide=equalsSigns+add;plus-subtract,minusxmCalculatingmachinesanabacusbeadoneofthefirstcalculatingmachinesfastandaccurateusedtodayCalculatingmachinesanabacusbelectroniccalculatoramoderncalculatingmachinecanadd,subtract,multiplyanddividecancalculatepercentagesandsquarerootsWhydoyouoftenuseit?electroniccalculatoramoderncomputeraverypowerfulcalculatingmachinecandoacalculationthatyoucouldnotdoinyourwholelifetimebrainlivingcomputerWhichismorepowerful?computeraverypowerfulcalculShakuntalaDevi7686369774870×2465099745779=?1894766817799542646277373028secondsHowlongdidittakehertoworkoutthisproblem?anIndianladyShakuntalaDevi76863697748916748676920039158098660927585380162483106680144308622407126516427934657040867096593279205767480806790022783016354924852380335745316935111903596577547340075681688305620821016129132845546805780158806771Howlongdidittaketosolvethisproblem?a=23a=?ShakuntalaDevi:secondsComputer:seconds546,372,8915060likelightinginaflash9167486769200391580986609275851.Saysomethingaboutnumbers.2.Thedevelopmentofcalculatingmachines.FreeTalk1.Saysomethingaboutnumbers+add;plus-18+26=44subtract,minus87-24=63=equalsA:

Add18and26B:18plus26is/equals44A:

Subtract24from87B:

87minus24is/equals6360+34=9435–20=15Pairwork+add;plus-18+26=44subtraxmultiply,times40x5=200÷

divide90÷30=3A:Multiply40by5B:40multipliedby5is200A:Divide90by30.B:90dividedby30equals320x5=10080÷16=5PairworkB1xmultiply,times40x5=200÷Whatisit?A:Thinkofanumber.Butdon’ttellmewhatitis.Add1.Multiplytheanswerby2.Nowadd3.Nowmultiplyby2again.Nowsubtract10.Nowtellmetheanswer.B:A:Workinpair4812Whatisit?A:Thinkofanumbe2abciiiiii4589316

72abciiiiii45893167Readthesenumbers1mile=1.609kmonepointsixonine40%ofourclassmatesaregirls.56ofthestudentsgettoschoolonfoot.fortypercentfivesixthsHistelephonenumberis86765434.IwasbornonJanuary18,1967.TheChangjiangRiveris6,378kilometerslong.Readthesenumbers1mile=1.632,805,041

thirty-twomillioneightyhundredandfivethousandandforty-one1,306,313,812

onebillionthreehundredandsixmillionthreehundredandthirteenthousandeighthundredandtwelveSaythesecardinalnumbers1950onethousandninehundredandfiftyoneninefivezeronineteenfifty32,805,041

thirty-twomillion1.72+272.105-223.10,000x364.1,440÷125.0.92x18.186.0.504÷0.12____________________________________________________________________________________1.72+2722.150-223.10,000x3.64.1,440÷1205.0.92x18.166.0.504÷1.12Workinpair1.72+27￥35，000FellowstudentsMrTanghasgivenourschoolagiftof￥35,000.Ourgroupthinksweshouldbuythesethreethings.First__________________.Thiswillcostabout￥________Second,__________________________________.Thiswillcostabout￥__________.Third,____________________________________________________Thiswillcostabout￥________.Haveyougotanyquestions?Weshouldbuynewequipmentforgym5,000Wewouldliketobuysomemorebooks

forthelibrary.

10,000Weshouldbuysomecomputers

20,000￥35，000Fellowstudentsatrafficaccidentatrafficaccident3,7483,6443,7293,639Thegraphshowsthatthere___________________________in1996inourcity.In______,thenumber_____to________and_____to_________in________.In_______thenumber________againto_______.It____to________in_________were3,691trafficaccidents1997rose3,748fell3,64419981999rose3,729fell3,6392,000Trafficaccidents1996-2000riserosefallfell3,7483,6443,7293,639ThegraphFahrenheit华伦海特

AndersCelsius摄尔西乌斯

25Ctwenty-fivedegreesCelsiuso77Fseventy-sevendegreesFahrenheitoFahrenheit华伦海特AndersCels18世纪初德国仪器制造家华伦海特发明了一个玻璃水银柱温度计，柱上刻有度数，当水银因热而膨胀时，可以读出柱高的增加数。华伦海特用冰与食盐的混合物所能得出的最低温度作为他的刻度的零度。按他的刻度，水的水的结冰读数为32°，水的沸腾读数为212°，两者距离为180°。这种刻度很快得到普遍应用，特别是在气象工作方面，因其刻度细，有利于气象测量。1730年法国博物学家列奥米尔建议把结冰与沸腾之间的距离分成80°，这就是列氏温标。不久以后瑞典天文学家摄尔西乌斯提议把两者中间的距离分成100°。18世纪末法国国民公会采用摄氏刻度作为公制的一部分，现在大多数国家都使用这种刻度的温度计。18世纪初德国仪器制造家华伦海特发明了一个玻璃水银柱温度计，30o60o90othirtydegreessixtydegreesninetydegrees30o60o90othirtydegreessixtyd1.WilburandOrvilleWright,WilburwasbornonApril16,1867andOrvillewasbornonAugust19,1871.

2.Ourschoolwasbuiltin1987.

3.ChangjiangRiver,6,378km4.TheHimalayasinTibet,China.MountQomolangma8,844.43metershigh.5.1991,aboutthreeyears.6.1,306,000,000.550,000,0007.400,000m2140,000m2(squaremeters)8.1,462km(bytrain)/1,300km15hoursbytrain.Oneandahalfhoursbyplane.9.5oCinwinter,26oCinsummeranswers1.WilburandOrvilleWright,NumbersNumbers

AncientnumbersGreekEgyptian(希腊的;希腊人;希腊语)(埃及的;埃及人)AncientnumbersGreekEgyptianRomanⅠ=1Ⅴ=5Ⅹ=10L=50C=100D=500M=1000III=3，Ⅳ=4，Ⅵ=6，ⅩⅨ=19，ⅩⅩ=20，ⅩLⅤ=MCMⅩⅩC=198045RomanⅠ=1Ⅴ=5Ⅹ=10L=5Chinese壹贰叁肆伍陆柒捌玖拾佰仟万Chinese壹贰叁肆伍陆柒捌玖拾佰0Whoinventedthesenumbers?23456789

Whoinvented“zero”?Whywasitaveryimportantinvention?Indian

ArabiannumberItmadeiteasiertowritebignumbersandtocalculate.0Whoinventedthesenumbers?30%apercentagen.百分数,百分比60oanumbershowingdegreesn.度数,度,aprotractorapairofcompasses√

56squareroot平方根30%apercentagen.百分数,百分比60oaWhatarethese?adecimalnumberadj.小数的,n.小数0.824apairofoddnumberadj.奇数的,单数的,不成对的,5189afraction

n.分数56apairofevennumberadj.偶数的32158Whatarethese?adecimalnumb+add;plus-subtract,minusxmultiply,times÷

divide=equalsSigns+add;plus-subtract,minusxmCalculatingmachinesanabacusbeadoneofthefirstcalculatingmachinesfastandaccurateusedtodayCalculatingmachinesanabacusbelectroniccalculatoramoderncalculatingmachinecanadd,subtract,multiplyanddividecancalculatepercentagesandsquarerootsWhydoyouoftenuseit?electroniccalculatoramoderncomputeraverypowerfulcalculatingmachinecandoacalculationthatyoucouldnotdoinyourwholelifetimebrainlivingcomputerWhichismorepowerful?computeraverypowerfulcalculShakuntalaDevi7686369774870×2465099745779=?1894766817799542646277373028secondsHowlongdidittakehertoworkoutthisproblem?anIndianladyShakuntalaDevi76863697748916748676920039158098660927585380162483106680144308622407126516427934657040867096593279205767480806790022783016354924852380335745316935111903596577547340075681688305620821016129132845546805780158806771Howlongdidittaketosolvethisproblem?a=23a=?ShakuntalaDevi:secondsComputer:seconds546,372,8915060likelightinginaflash9167486769200391580986609275851.Saysomethingaboutnumbers.2.Thedevelopmentofcalculatingmachines.FreeTalk1.Saysomethingaboutnumbers+add;plus-18+26=44subtract,minus87-24=63=equalsA:

Add18and26B:18plus26is/equals44A:

Subtract24from87B:

87minus24is/equals6360+34=9435–20=15Pairwork+add;plus-18+26=44subtraxmultiply,times40x5=200÷

divide90÷30=3A:Multiply40by5B:40multipliedby5is200A:Divide90by30.B:90dividedby30equals320x5=10080÷16=5PairworkB1xmultiply,times40x5=200÷Whatisit?A:Thinkofanumber.Butdon’ttellmewhatitis.Add1.Multiplytheanswerby2.Nowadd3.Nowmultiplyby2again.Nowsubtract10.Nowtellmetheanswer.B:A:Workinpair4812Whatisit?A:Thinkofanumbe2abciiiiii4589316

72abciiiiii45893167Readthesenumbers1mile=1.609kmonepointsixonine40%ofourclassmatesaregirls.56ofthestudentsgettoschoolonfoot.fortypercentfivesixthsHistelephonenumberis86765434.IwasbornonJanuary18,1967.TheChangjiangRiveris6,378kilometerslong.Readthesenumbers1mile=1.632,805,041

thirty-twomillioneightyhundredandfivethousandandforty-one1,306,313,812

onebillionthreehundredandsixmillionthreehundredandthirteenthousandeighthundredandtwelveSaythesecardinalnumbers1950onethousandninehundredandfiftyoneninefivezeronineteenfifty32,805,041

thirty-twomillion1.72+272.105-223.10,000x364.1,440÷125.0.92x18.186.0.504÷0.12____________________________________________________________________________________1.72+2722.150-223.10,000x3.64.1,440÷1205.0.92x18.166.0.504÷1.12Workinpair1.72+27￥35，000FellowstudentsMrTanghasgivenourschoolagiftof￥35,000.Ourgroupthinksweshouldbuythesethreethings.First__________________.Thiswillcostabout￥________Second,__________________________________.Thiswillcostabout￥__________.Third,____________________________________________________Thiswillcostabout￥________.Haveyougotanyquestions?Weshouldbuynewequipmentforgym5,000Wewouldliketobuysomemorebooks

forthelibrary.

10,000Weshouldbuysomecomputers

20,000￥35，000Fellowstudentsatrafficaccidentatrafficaccident3,7483,6443,7293,639Thegraphshowsthatthere___________________________in1996inourcity.In______,thenumber_____to________and_____to_________in________.In_______thenumber________againto______