英语中基数词序数词分数小数和百分数的读法省公共课一等奖全国赛课获奖课件.pptx

语法英语中基数词、序数词、分数、小数和百分数写法,读法第1页1.基数词读法：基数词读法：A.23 89 B.223 416 809 twenty-three eighty-ninetwo hundred and twenty-threefour hundred and sixteeneight hundred and nine第2页How to say?百千 万十万百万千万亿十亿hundredthousand ten thousand one hundred thousandmillion ten million one thousand millionbillion第3页C.1000以上数从后向前数，每三位数加一以上数从后向前数，每三位数加一“,”（千分位）；第一个（千分位）；第一个“,”号前为号前为thousand;第二个第二个“,”号前为号前为million;第三个第三个“,”号前为号前为billion。如：。如：1,001 4,000 9,743 174,301750,000,000 one thousand and onefour thousandnine thousand,seven hundred and forty-threea(one)hundred and seventy-four thousand,three hundred and oneseven hundred and fifty million第4页2.序数词读法序数词读法序数词普通以与之对应基数词加词尾序数词普通以与之对应基数词加词尾-th组成，如：组成，如：tenth（第十），但下面（第十），但下面这些基数词在变序数词时，这些基数词在变序数词时，有尤其地有尤其地方。如：方。如：A.one two three five eight nine twelvefirstsecondthirdfiftheighthninthtwelfth第5页B.以以-ty结尾词，要先变结尾词，要先变-y为为-i，再加，再加-eth。如：。如：twenty fortyC.以以one,two,three,five,nine收尾多位序数词，收尾多位序数词，要照第一条方法变。如：要照第一条方法变。如：twenty-one twenty-two thirty-five ninety-ninea hundred and fifty-three twentiethfortiethtwenty-firsttwenty-secondthirty-fifthninety-nintha hundred and fifty-third第6页基数词（分子）序数词（分母），基数词（分子）序数词（分母），分子大于，分母用复数如：分子大于，分母用复数如：2/3 7/9 5/12 one-fourthtwo-thirdsseven-ninthsfive-twelfthstwo and three-fifthsthirty and seven-eighths3.分数词读法分数词读法2353078第7页一些特殊表示法一些特殊表示法 a/one halfa/one quarterthree quarters小数读法小数读法7.8 0.4 0.03 0.125 14.397 seven point eight（zero）point four（zero）point zero three(zero)point one two fivefourteen point three nine seven第8页5)百分数读法百分数读法27%45%86%twenty-seven percent forty-five percent eighty-six percent第9页第10页Practice Read the following numbers.2/55/89/103/8two-fifths five-eighthsnine-tenthsthree-eighths 第11页0.50.81.23796,000 point five point eight one point two threeseven hundred,ninety-six thousand第12页Find the mistakes52,470,383-fifty-two million,four hundred and seventy,three hundred and eighty-three 100,000,000-hundred million365,528,462-three hundred and sixty-five million,five hundred and twenty-eight thousand,four hundred and sixty-two1,000,000,000-one thousand/one billion52,470,383-fifty-two million,four hundred and seventy thousand,three hundred and eighty-three100,000,000-one hundred million第13页Now lets say:2/5 5/8 9/10 3/8 5/6 1/2 1/4 3/4practice第14页Count these1.What is of 6,000,000?2.How much is 35,246,0003.plus 12,800,000?3.What is 25%of 200,000,000?4.How much is 260,408,396 plus5.5,284,700?5.What is of 1,000,500,000?6.What is 10%of 800,000,000?3,000,00048,046,00050,000,000265,693,096750,375,00080,000,000第15页 exercise 9 on P 93Answers:B B C B第16页Work in pairWe writeWe say400,0002,000,0005,100,00048,000,50050,567,489123,456,789 four hundred thousand two million five million one hundred thousand forty-eight million,five hundred fifty million,five hundred and sixty-seven thousand four hundred and eighty-nine one hundred and twenty-three million four hundred and fifty-six thousand seven hundred and eighty-nine第17页