数,分数,小数读法

,*,单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,*,单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,Module 5,A lesson in a lab,Vocabulary,英语中基数词、序数词、分数、小数和百分数的读法,1.,基数词的读法：,A.,先说“几十”， 再说“几”，中间用连字符。如：,23 89,B.,先说“几百”， 再加,and,再加末两位数（或末位数）。如：,223,416,809,twenty-three,eighty-nine,two hundred and twenty-three,four hundred and sixteen,eight hundred and nine,C. 1000,以上的数先从后向前数，每三位数加一“,”,（千分位）；第一个“,”,号前为,thousand;,第二个“,”,号前为,million;,第三个“,”,号前为,billion,。如：,1,001,4,000,9,743,174,301,750,000,000,one thousand and one,four thousand,nine thousand, seven hundred and forty-three,a (one) hundred and seventy-four thousand, three hundred and one,seven hundred and fifty million,2.,序数词的读法,序数词一般以与之相应的基数词加词尾,-,th,构成，如：,tenth,（第十），但下面这些基数词在变序数词时， 有特别的地方。如：,A.,one two ,three five,eight nine,twelve,first,second,third,fifth,eighth,ninth,twelfth,B.,以,-,ty,结尾的词，要先变,-y,为,-i,，再加,-eth,。如：,twenty,forty,C.,以,one, two, three, five, nine,收尾的多位数词，要照第一条方法变。如：,twenty-one,twenty-two ,thirty-five ,ninety-nine,a hundred and fifty-three ,twentieth,fortieth,twenty-first,twenty-second,thirty-fifth,ninety-ninth,a hundred and fifty-third,基数词表示分子，序数词表示分母，除了分子是“,1”,的情况外，序数词要用复数。如：, 2/3,7/9 5/12,one-fourth,two-thirds,seven-ninths,five-twelfths,two and three-fifths,thirty and seven-eighths,3.,分数词的读法,2,3,5,30,7,8,一些特殊的表达法,a / one half,a / one quarter,three quarters,4.,小数的读法,7.8,0.4,0.03,0.125,14.397,seven point eight,zero point four,zero point zero three,zero point one two five,fourteen point three nine seven,5),百分数的读法,27% ,45% ,86% ,twenty-seven percent,forty-five percent,eighty-six percent,Can you say the following in English correctly?,1,000,2,000,12,000,112,000,796,000,one,thousand,two thousand,twelve,thousand,one hundred,twelve thousand,seven hundred, ninety six thousand,879,457,eight hundred, seventy-nine thousand, four hundred and fifty-seven,1,000,000,9,000,000,32,000,000,212,000,000,one million,nine million,thirty-two million,two hundred, twelve million,988,766,688,nine hundred, eighty-eight million, seven hundred, sixty-six thousand, six hundred and eighty-eight,987,654,321,nine hundred, eighty-seven million, six hundred, fifty-four thousand, three hundred and twenty-one,1,000,000,000,one billion,9,000,000,000,nine billion,32,000,000,000,thirty-two,billion,564,865,000,000,five hundred, sixty-four billion, eight hundred, sixty-five million,978,876,675,467,nine hundred, seventy-eight billion, eight hundred, seventy-six million, six hundred, seventy-five thousand, four hundred and sixty-seven,Fraction,分数,We write,1/5,1/6,1/7,4/7,We say,one fifth,one sixth,one seventh,four sevenths,7/10,97/111,seven tenths,ninety-seven one hundred and elevenths,45/87,forty-five eighty-sevenths,总结,:,你能看出他们有什么特点吗？,分子用基数词,分母用序数词,;,分子大于,1,分母的序数词需要加,s,。,另外,还有几个特殊表达的情况,:,1/2,1/4,1/3,3/4,2/3,one half,one quarter,one third,three quarters,two thirds,50%,25%,75%,百分数：,percentage,Practice,Now lets say: 2/5 5/8 9/10 3/8 5/6,two-fifths,five-eighths,nine-tenths,three-eighths,five-sixths,Can you say the following in English correctly?,0.5,0.8,0.76,1.23,point five,point eight,point seven six,one point two three,23.45,100.32,87.675,7.564,twenty-three,point,four five,one hundred,point,three two,eighty-seven,point,six seven five,seven,point,five six four,point,point,point,point,总结：小数点用,point,Read these questions aloud and say the answers.,What is of 6,000,000?,2. How much is 35,246,000 plus 12,800,000?,3. What is 25%,of 200,000,000?,three million,forty-eight million, forty-six thousand,fifty million,4. How much is 260,408,396 and 5,284,700?,two hundred, sixty-five million, six hundred, ninety-three thousand, ninety-six,5. What is of 1,000,500,000?,seven hundred, fifty million, three hundred, seventy-five thousand,6. What is 10% of 800,000,000?,eighty million,See you!,