资源简介

(共41张PPT)
Unit 2 Amazing numbers
主题范畴：
人与社会
主题群：
历史、社会与文化；科学与技术
子主题：
对世界、国家、人民和社会进步有突出贡献的人物；科学技术与工程，人类发明与创新
Key question
What is the role of numbers in our daily lives
master the rules of using cardinal numbers and ordinal numbers;
give correct instructions about numbers.
Learning objectives 学习目标
At the end of the class, I’ll be able to:
1. The number of students in our class is 40.
2. I’d like one grain of rice for the first square of the chessboard, …
3. It is worth three hundred.
4. The little boy was born in 11 Dec. 2018.
5. Mo Yan won the Nobel Prize for Literature in 2012.
6. Who is the woman, the second in the second line
Have a look
A Cardinal numbers
1. The concept of cardinal numbers
2. The formation of cardinal numbers
3. The usage of cardinal numbers
Section 2 Exploring and applying rules
The concept of cardinal numbers
We use cardinal numbers to count things.
1. People from about 180 countries and areas live
in New York.
2. The CN Tower is 1,815 feet tall.
3. Red Square in Moscow is about 91,000 square
metres in size.
4. France has an area of over 26,000 square miles.
5. There are about 8,000,000 people living in London.
6. Tokyo, the capital of Japan, has over 13,000,000
people.
0～12为基本单词：
zero one two three four five
six seven eight nine ten eleven
twelve
13～19为对应的个位数单词（或变形）后加-teen：
thirteen fourteen
fifteen sixteen
seventeen eighteen
nineteen
3 three 13 thirteen
11 eleven 15 fifteen
12 twelve 18 eighteen
The formation of cardinal numbers
20～90为其对应个位数单词（或变形）后加-ty：
twenty thirty forty fifty sixty
seventy eighty ninety
21～99的两位数，十位与个位之间用连字符“-”：
26 twenty-six 99 ninety-nine
When we say thirteen, we stress the second syllable. When we say thirty, we stress the first syllable.
20 twenty 70 seventy
30 thirty 82 eighty-two
50 fifty 98 ninety-eight
100 one hundred
200 two hundred
375 three hundred and seventy-five
101～999的三位数，百位数和十位数（若无十位数则和个位数）之间用and连接，百后用单数形式：
103 a/one hundred and three
225 two hundred and twenty-five
999 nine hundred and ninety-nine
多位数：
注意每三个数为一个单位，按照百、十、个向下读。
6
,
500
,
431
,
729
billion
million
thousand
seven hundred and twenty-nine
six billion,
five hundred million,
four hundred and thirty-one thousand,
在英语中，对于万以上的数字，我们该如何表达呢？这就要记住英语数字读法特点。以下面一个数字为例：
Let’s sum up the rules!
When we read out numbers, we do not add -s to the words hundred, _________, _________, and __________.
We put ________ between hundred and ten.
thousand
million
billion
and
表示数量：one book (一本书)；three apples (三个苹果)。
表示时刻、年份、年代：nine o’clock (九点钟)；in two thousand and twenty (在2020年)；in the 1960s (在20世纪60年代)。
表示年龄：He is ten (years old). (他十岁了)；in one’s thirties (在某人三十几岁时)。
表示事物编号：Room 105(105房间)；Lesson One (第一课)；Bus No.10 (10路公共汽车)。
表示电话号码：Phone number 6225371 (电话号码 6225371)。
数学运算：Two and three is five. (二加三等于五)。
The usage of cardinal numbers
1) hundred, thousand, million, billion这些词前面若有表示具体数字的词时，它们不能加“s”，反之要加“s”，并与of短语连用。
three thousand people
thousands of people
2) 年份用基数词表示，分两位一读，年份前面用介词in。
在1999年
in nineteen ninety-nine
Tips
3) 表示整十的基数词用复数形式可以表示人的大约岁数或年代。
在他二十岁出头时
在20世纪30年代
in his early twenties
in the 1930s
读作 in the nineteen thirties
4,056
= four thousand and fifty-six
23,813
= twenty-three thousand eight hundred and thirteen
567,110
= five hundred and sixty-seven thousand one hundred and ten
6,425,200
= six million four hundred and twenty-five thousand two hundred
How do we say the following numbers
Practice
B Ordinal numbers
1. The concept of ordinal numbers
2. The formation of ordinal numbers
3. The usage of ordinal numbers
We use ordinal numbers to show the order of things.
Women’s Day is on the eighth of March.
Our flat is on the seventh floor.
He is always the first to come to the school in our class.
The concept of ordinal numbers
1) 一般来说，是由相应的基数词加词尾th构成。
◇ four + th
◇ seven + th
◇ ten + th
2) 有些基数词在变为序数词时，有特殊的变化。
◇ one ◇ two
◇ three ◇ five
◇ eight ◇ nine
◇ twelve
→ fourth
→ seventh
→ tenth
→ first
→ third
→ eighth
→ twelfth
→ second
→ fifth
→ ninth
The formation of ordinal numbers
3) 十位整数序数词的构成方法是将基数词的词尾y变成i，然后再加eth。
◇ twenty
◇ thirty
→ twentieth
→ thirtieth
◇ twenty-one
◇ thirty-five
◇ a hundred and fifty-three
4) 两位或两位以上的基数词变成序数词时，仅将个位数变成序数词。
→ twenty-first
→ thirty-fifth
→ a hundred and fifty-third
◇ forty
◇ ninety
→ fortieth
→ ninetieth
Learn the numbers and find out the rules.
Work out the rule
We form most ordinal numbers by adding ____ 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.).
-th
基变序，有规律，词尾加上th。一二三特殊记，词尾字母t,d,d。八加h，九减e，ve要用f替。ty要变tie，然后再加th。若是遇上几十几，只变个位就可以。
The usage of ordinal numbers
表示顺序：常与定冠词“the”连用。the first day of the month (这个月的第一天)；the second chapter (第二章)；the third floor (三楼)；on his fourteenth birthday (在他十四岁生日那天)。
表示日期：June 1st (六月一日)，读作“June the first”；in the twenty-first century (在21世纪)
用于最高级前加强语气：He is the second tallest boy in our class. (他是我们班第二高的男孩)。
分数表达：分子用基数词，分母用序数词。当分子大于1时，分母用复数。one fifth (五分之一)；two thirds (三分之二)。
1) 序数词前面通常要加定冠词the，但当序数词作定语修饰名词且前面有形容词性物主代词或名词所有格时，the可以省略。
Take the first right.
My first teacher
Lily’s third book
我的第一个老师
莉莉的第三本书
在第一个路口向右拐。
Tips
2) 日期可以用基数词或序数词来表示。读时前面要加定冠词the，日期前面要用介词on。
在6月1日
3) 编号可以用基数词或序数词来表示。序数词位于名词之前，前面要加定冠词the，而基数词位于名词之后，且名词和基数词的首字母都要大写。
the second part = Part Two
on June 1 / on June 1st
读作 on June the first
Instructions about
numbers
Can you give correct instructions about addition (加法), subtraction (减法), multiplication (乘法) and division (除法)
3+9
9-3
3×9
9÷3
Add 3 and 9.
Subtract 3 from 9.
Multiply 3 by 9.
Divide 9 by 3.
用英语描述算式时，多用祈使句。这些祈使句由表示加、减、乘、除的动词开头，但要注意每个动词各自的搭配习惯。
Table I
Look & Learn
上述几个结构中的3 plus 9，9 multiplied by 3等作主语，要把它们看成是一个整体，谓语动词要用单数形式is或equals。
Table II
3+9=12
9-3=6
3×9=27
9÷3=3
3 plus 9 equals/is 12.
9 minus 3 equals/is 6.
3 multiplied by 9 equals/is 27.
9 divided by 3 equals/is 3.
Plus and minus are prepositions.
祈使句 “主一系一表” 结构
加 (A+B) Add A and B. A plus B
equals/is (A+B).
减 (A-B) Subtract B from A. A minus B
equals/is (A-B).
乘(A×B) Multiply A by B. A multiplied by B equals/is (A×B).
除(A÷B) Divide A by B. A divided by B equals/is (A÷B).
In pairs, complete the sentences like those in Table I and Table II.
1 S1: A 11 1.
S2: p equals/is . ( )
2 S1: S 5 13.
S2: m equals/is . ( )
3 S1: M 7 8.
S2: m by equals/is . ( )
and
ubtract
from
13
inus
5
8
13-5=8
ultiply
by
7
ultiplied
8
56
7x8=56
dd
11
lus
1
12
11+1=12
4 S1: D 16 4.
S2: d by equals/is . ( )
5 S1: A 9 6.
S2: p equals/is . ( )
6 S1: A 14 and 4 and d the answer by 2.
S2: p and d the answer by
equals/is . ( )
ivide
by
16
ivided
4
4
16÷4= 4
dd
and
9
lus
6
15
9+6= 15
dd
ivide
14
lus
4
ivide
2
9
(14+4)÷2= 9
Add 6 and 8.
6 plus 8 is/equals 14.
Use the numbers from the chart to give instructions about numbers.
基数词表示数量的多少，常用来谈论数目、时间等，如：eleven miles，nine o’clock等。
序数词表示事物的顺序，常用来谈论日期、楼层、位置等，如：on 10th May等。
数字运算:
Practice
1 Look at the information about the three longest rivers in the world. Take turns asking and answering questions about the rivers.
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.
The Nile River
Africa
6,671 km
The Amazon River
South America
6,480 km
The Yangtze River
Asia
6,300 km
2 Look at the list of the highest mountains in Asia, North America and Africa. Describe the mountains with cardinal and ordinal numbers.
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
The tallest mountain in ... is ... It is ... metres high.
... is the second-highest mountain in ...
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
The tallest mountain in ... is ... It is ... metres high.
... is the second-highest mountain in ...
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 ...
一、单项选择
( ) 1. Lesson _____ is on _____ page of the Chinese book.
A. Six; the twenty-fourth
B. Sixth; the twenty-fourth
C. Six; twenty-four
D. Sixth; twenty-four
( ) 2. There are _____ students in our school.
A. one thousand and three hundred and fifty-one B. one thousand three hundred and fifty-one
C. one thousand three hundred fifty-one
D. one thousand three hundred fifty one
A
B
( ) 3. The Palace Museum is a famous place in Beijing.
Every day, _____ people visit it.
A. thousand B. thousand of
C. thousands D. thousands of
( ) 4. There are _____ students in my class and I’m
_______ tallest student.
A. fifty; three B. fiftieth; the third
C. fifty; the third D. fifty; third
D
C
二、阅读下面的句子，根据所给提示，用合适的单词填空。
1. The city wall in Nanjing has a history of more than ______________(700) years.
2. The height of the CN Tower is about
___________________________________(1,815) feet.
3. He is ___________(第十二) student to get to the top of the hill.
4. China has an area of more than ____________________
__________(9,600,000) square kilometres.
5. Nearly __________(五百万) of fans would like to go to Qatar to watch the _____________(第二十二) World Cup.
seven hundred
one thousand eight hundred and fifteen
the twelfth
9 million, six hundred
thousand
twenty-second
five million
Finish the grammar exercise.
Optional: Make a report about a place of interest in Guangzhou. Use cardinal numbers and ordinal numbers properly.

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