Unit 2 Amazing numbers （Grammar）课件 2025-2026学年沪教版（2024）英语八年级上册

Amazing Amazing numbers numbers Unit 2 Lesson 3 Grammar 英语沪教版八年级上册 1. 准确掌握基数词和序数词的形式、读音及拼写规则；熟练记忆大数字 （如 thousand、million、billion ）的英语表达及使用规范。 2. 在实际语境中正确运用基数词和序数词进行交流; 能够准确读写与数字相关的信息，在涉及地理数据（如河流长度、山脉高度及排名 ）的描述中做到语言表达准确、流畅。 Learning objectives 重点 重点 Watch and answer What is the video about? It’s about numbers. Let’s try Can you count from 1 to 20? Let’s try. Think and say What’s the difference between cardinal numbers and ordinal numbers? Cardinal numbers show the quantity(e.g., one,two), while ordinal numbers show the order(e.g., first, second). Look and say Can you read these numbers? 11 15 20 82 12 18 50 98 eleven twelve fifteen eighteen twenty fifty eighty-two ninety-eight 100 375 one hundred three hundred and seventy-five 1,000 100,000 4,189 one thousand four thousand one hundred and eighty-nine one hundred thousand 1,000,000 1,000,000,000 2,000,000 3,000,000,000 one million one billion three billion two million When we read out numbers, we do not add -s to the words hundred, thousand, million and billion. We put and between hundred and ten. Summarize 基数词表示数量的多少，常用来谈论数目、时间等。 1-10 1 one, 2 two, 3 three, 4 four, 5 five, 6 six, 7 seven, 8 eight, 9 nine, 10 ten 十位数11-19 14 fourteen, 16 sixteen, 17 seventeen, 19 nineteen 11 eleven, 12 twelve, 13 thirteen, 15 fifteen, 18 eighteen 21-99 （1）整数几十的共同特点是以-ty结尾： ① 由其个位数形式后添加后缀-ty构成： 60 sixty，70 seventy ② 特殊形式： 20 twenty，30 thirty （2）对于个位数不为零的两位数，由十位数加个位数构成，中间用连字符号。 e.g. 82 — eighty-two 百位数 百位数与十位数之间用and连接。 e.g. 106 — one hundred and six 122 — one hundred and twenty-two 千位数以上 从数字的右端向左端数起，每三位数加一个逗号“,”。从右开始，第一个“,”前的数字后添加 thousand（千），第二个 “,”前面的数字后添加 million（百万）。 1,000 a / one thousand 2,000,000 two million 2,648 two thousand six hundred and forty-eight 16,250,064 sixteen million two hundred and fifty thousand and sixty-four Let’s try 分段： 5 thousand, 280 读作： five thousand, two hundred and eighty 5,280 分段： 16 million, 405 thousand, 992 读作： sixteen million, four hundred and five thousand, nine hundred and ninety-two 16,405,992 分段： 103 million, 700 thousand, 56 读作： one hundred and three million, seven hundred thousand and fifty-six 103,700,056 Let’s learn 当hundred, thousand, million, billion等词前面有具体数字修饰时，必须用单数形式。 e.g. There are three hundred students in our school. 2. 表示整十的基数词的复数形式，可用于表示人的年龄段或特定的年代 e.g. He is in his early thirties. 他三十出头。 This took place in the 1930s. 这发生在二十世纪三十年代。 3. 某些固定搭配中用复数形式的基数词，表示不确切数字。 e.g. 数以百计的：hundreds of 成千上万的：thousands and thousands of We use ordinal numbers to show the order of things. Observe and answer 1st first 7th seventh 13th thirteenth 19th nineteenth 2nd second 8th eighth 14th fourteenth 20th twentieth 3rd third 9th ninth 15th fifteenth 21st twenty-first 4th fourth 10th tenth 16th sixteenth 33rd thirty-third 5th fifth 11th eleventh 17th seventeenth 40th fortieth 6th sixth 12th twelfth 18th eighteenth 100th hundredth Which ordinal numbers don't follow the regular - th ending rule? first, second, third Summarize We form most ordinal numbers by adding - th to the cardinal numbers, except first, second and third. For numbers of 21 and above, the ordinal number is formed based on the last digit (21st, 22nd, 23rd, etc). Let’s learn 1. 序数词在表示顺序时，通常前面要加the，前面有物主代词、指示代词时，不用冠词 e.g. The first truck is carrying baskets. 2. 序数词前面可加“a/an”来表示 “再一”，“又一” 的意思。 e.g. We have to do it a second time. 我们不得不再做一次。 3. 表示年、月、日时， 年用基数词表示， 日用序数词表示。 e.g. 1949年10月1日读作: October (the) first, nineteen forty-nine Let’s learn 4. 编码时，既可用基数词也可用序数词。 e.g. World War I = the First World War 第一次世界大战 Page One = the first page 第一页 the Fourth Lesson = Lesson Four 第四课 5. 分数的表达：分子用基数词，分母用序数词；当分子大于1时，分母的序数词用复数形式。 e.g. 2/3—two thirds Let’s learn 6. 表示顺序或排名 He won the first prize.（他获得了第一名。） 7. 表示楼层、章节、版本等 I live on the 5th floor.（我住在5楼。） Read the 10th chapter of the book.（阅读这本书的第10章。） This is the 3rd edition of the dictionary.（这是这本词典的第3版。） 8. 表示“第几个”人或事物 She was the first to arrive.（她是第一个到的。） The second student on the list is absent.（名单上的第二个学生缺席了。） Chant and learn 基变序，有规律 ，后面th加上去；一二三，特殊记， 后面字母t, d, d；八去t，九去e，整数中的y要变成ie； f来把ve替，若是遇到几十几 ，只变个位就可以；序数词前要加the, 我们一定要牢记。 Look at the information about the three longest rivers in the world. Take turns asking and answering questions about the rivers. Look and talk S1: Which is the first-longest river in the world? Where is it? How long is it? S2: The Nile River is the first-longest river. It’s in Africa. It’s about 6,671 km long. Look at the list of the highest mountains in Asia, North America and Africa. Describe the mountains with cardinal and ordinal numbers. Look and describe Rank Name Height Continent 1 Mt. Qomolangma 8,848.86 m Asia 2 Mt. Qogir 8,611 m Asia 3 Mt. Kanchenjunga 8,586 m Asia Rank Name Height Continent 1 Mt. Denali 6,190 m North America 2 Mt. Logan 5,959 m North America 3 Pico de Orizaba 5,610 m North America Look and describe Rank Name Height Continent 1 Mt. Kilimanjaro 5,895 m Africa 2 Mt. Kenya 5,199 m Africa 3 Mt. Stanley 5,109 m Africa The tallest mountain in ... is ... It is ... metres high. ... is the second-highest mountain in ... Fill in the blanks Fill in the blanks using ordinal numbers. 1. Monday is the ________ day of a week in the West. 2. Winter is the _________ season of a year. 3. Children’s Day is on June the _________ each year. 4. September is the __________ month in a year. 5. December the ____________ is Christmas Day. second fourth first ninth twenty-fifth Work in groups to create a short dialogue using cardinal and ordinal numbers based on the topic of "A School Sports Meet". Make a dialogue A: How many students are taking part in the 100 - metre race? B: There are ... students. A: Which place did Tom get in the long - jump? B: He got the ... place. Example Summary Cardinal& Ordinal Numbers Cardinal Numbers Ordinal Numbers Function: Count things Mastered Rules Note:“hundred,thousand,million,billion”—singular after specific numbers Formation Function: Show order Note: Use “the” before ordinal numbers (most cases) 1-100 formation Large numbers (thousand, million, billion) Special: 1st, 2nd, 3rd, etc. Most: Add “-th” to cardinals 1. Base: Write a short composition about your family, using at least 3 cardinal numbers and 2 ordinal numbers. Homework 2. Practice: Search for information about the top 5 tallest buildings in the world and make a note - card in English, using cardinal and ordinal numbers correctly. 3. Expand: Interview your classmates about their favorite numbers and why, then write a report in English, applying the knowledge of cardinal and ordinal numbers. Bye numbers Bye $