Vocabulary and speaking.ppt

1、外研版 高一年级 (必修1) Module 5,英语课件,Vocabulary and speaking,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）

2、；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

3、-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 ,tw

4、entieth,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

5、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?,

6、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 milli

7、on 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 b

8、illion,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,Lets have a match to

9、see who can say the following numbers correctly and quickly.,765,847 seven hundred, sixty-five thousand, eight hundred and forty-seven,Practice,2. 756,980,000 seven hundred, fifty-six million, nine hundred and eighty thousand 3. 345,567,887,987 three hundred, forty-five billion, five hundred, sixty-

10、seven million, eight hundred, eighty-seven thousand, nine hundred and eighty-seven,4. 897,786,000,576 eight hundred, ninety-seven billion, seven hundred, eighty-six million, five hundred and seventy-six 5. 786,087,670,756 seven hundred, eighty-six billion, eighty-seven million, six hundred, seventy

11、thousand, seven hundred and fifty-six,6. 987,765,654,345 nine hundred, eighty-seven billion, seven hundred, sixty-five million, six hundred, fifty-four thousand, three hundred and forty-five,Read these questions aloud and say the answers.,What is of 6,000,000? 2. How much is 35,246,000 plus 12,800,0

12、00? 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, s

13、eventy-five thousand 6. What is 10% of 800,000,000? eighty million,1/5 1/6 1/7 4/7,one fifth one sixth one seventh four sevenths,Can you say the following in English correctly?,7/10 97/111,seven tenths ninety-seven one hundred and elevenths forty-five eighty-sevenths,总结: 你能看出他们有什么特点吗？,45/87,分子用基数词,分

14、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,Now lets say: 2/5 5/8 9/10 3/8 5/6,Practice,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