人教PEP版小升初语法数词之基数词课件（45张PPT）

(共45张PPT)
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数词定义
基数词的表达方法
基数词的用法
考点
seven kids
Bus Three
the first prize
定义：
表示数目多少或
顺序的词叫数词
数词
基数词：
表示数目的多少
序数词：
表示顺序
Summary
one pen
twelve clocks
four books
考点01：基数词的表示方法
1.1~12的基数词如下：
one 1， two2，three3，four4，five5，six6，seven7，eight8，
nine9，ten10，eleven11，twelve12
I’m eighteen now.
She spent seventeen years as a teacher.
2. 13~19,由基数词+后缀-teen构成：
thirteen13,fourteen14,fifteen15,sixteen16,seventeen17 ,
eighteen18,nineteen19
Thirty of them are Party members.
There are fifty stars on the American flag.
3. 20~90等十位数均由基数词+后缀-ty构成：
twenty20,thirty30,forty40,fifty50, sixty60,seventy70,
eighty80,ninety90
There are twenty-six letters in English.
There are fifty-six peoples in our country.
4. 几十几由表示几十的基数词+表示几的基数词 构成，
中间须有连字符“-”
one hundred
four hundred and twenty-five
three hundred and seven
5. 百位数的读法：由基数词+hundred构成，如：包含十位数及个位数，中间用and连接
two thousand and eight
thirty-five thousand four hundred and fifty-six
ten thousand one hundred and one
6. 百位数的读法：由基数词+thousand构成，
如包含百位，十位及个位按照百位读法
one million
three million four hundred and twenty-one thousand five hundred and fifty-one
two million three hundred thousand
7. 百万位数的读法：由基数词+million构成，如
包含千位，百位，十位及个位按照千位数读法
eight billion
five hundred billion
8. 千万位数的读法：由基数词+billion构成，如
包含百万，千位，百位，十位及个位按照百 万数的读法
即学即练
读出下列数字的英文表达
9 18
86 90
306
671
4321
nine
ninety
eighty-six
eighteen
six hundred and seventy-one
three hundred and six
four thousand three hundred and twenty-one
读出下列数字的英文表达
7654321
1987654321
即学即练
seven million six hundred and fifty four thousand three hundred and twenty-one
one billion nine hundred and eighty-seven million six hundred and fifty-four thousand three hundred and twenty-one
即学即练
--Excuse me, how does this number 20135 read
-- It reads_______.
A. twenty thousands one hundred and thirty-five
B. twenty thousand one hundred thirty-five
C. twenty thousand one hundred and thirty-five
D. twenty thousands one hundred thirty-five
C
Summary
12:00
twelve o’clock
six thirty
6:30
nine fifteen
9:15
考点02：时间表示法
1. 顺时针读法，即按顺序读出几点几分
30分
几
点
差
几
分
几
点
过
几
分
2. 逆时针读法，表示几点过几分：
万能公式：分钟+past+时 （分钟≤30）
3. 逆时针读法，表示几点差几分：
万能公式：（60-分钟）+to+（时+1）（分钟>30）
15分钟可用a quarter表示
30分钟可用half表示
即学即练
写出下列时间的英文表达
8：30 5:28
9:10 6:45
2:30
eight thirty
nine ten
five twenty-eight
half past eight
two thirty
six forty-five
a quarter past seven
twenty-eight past five
ten past nine
half past two
Tips:
说差可用to, 说过只用past。
即学即练
1.-----“What time do you usually get up, John ”
-----“I usually get up at ________.”
half past six B. half to six C. half after six
2.— It’s already 7:40 now. When will the film start
—___. We still have five minutes.
A. A quarter to seven
B. Seven past forty-five
C. A quarter to eight
A
C
Summary
There are two hundred students in the hall.
There were thousands of people in the race.
考点03：表示不确定的数目
两百
（确定的数目）
成千上万的
（不确定的数目））
表示确定的数目
Tips: 有数字，无s无of
hundreds /thousands /millions /billions of
表示不确定的数目
基数词 +hundred/thousand/million/billion
Tips: 无数字，有s，加of
常见词组
hundreds of 数以百计
thousands of 数以千计
millions of 数以百万计
billions of 数以十亿计
1. We planted trees last year.
A. hundreds of B. hundred of
C. five hundreds D. five hundred of
2. —Jackie Chan has donated_________ dollars to
charity.
—He is an example to us all.
A. thousand B. thousands
C. thousand of D. thousands of
即学即练
A
D
3. -- _____ of volunteers will be needed for 2014 International Horticulture Exposition in Qingdao.
--Let’s go and _____ them.
A. Thousands, join B. Thousand, be a member of
C. Three thousand, take part in D. Thousands, be in
4. --How many teachers are there in your school --About four______.
A. hundreds of B. hundred C. hundreds
5.______volunteers sent books to a mountain village
school on Children’s Day.
A. Two hundreds of B. Two hundred of
C. Two hundreds D. Two hundred
A
B
D
考点04：表示人的年龄
1.数字+years old
Tom is twelve years old.
2.数-单-名
Mike is an eight-year-old boy.
His father joined the Party in______ and died in _______.
A. 1930s; his fifty
B. 1930; his fifty
C. the 1930; fifty
D. the 1930s ;his fifties
即学即练
D
Tips:
in one’s +几十的复数形式
表示“在某人几十岁的时候”
考点04：表示人的年龄
3.At the age of +基数词
4. in one’s +整十的复数形式
I will retire in my fifties.
At the age of twenty-two ,she found her first job.
Summary
考点05：加减乘除表示法
+
=
+
=
One plus one is two.
Two plus two is four.
1.“加”用plus，and表示；
“等于”用is，make，equal等词表示
Ten minus six is four.
Take six from ten and the remainder is four.
-
=
2.“减”用minus或take from表示
Sixteen divided by four is four.
÷
=
4.“除”用divided表示，常用结构：divided by
Three times four is twelve.
Multiply three by four, we get twelve.
+
=
3.“乘”用time（动词）或multiply表示
1.We all know that two and one is three. Here
“is” means“_________”.
A. = B. % C. > D. <
2.--If a=4,b=5,what’s the answer to the question
“a+2ab+1= ”
--__________.
A. Forty
B. Forty-five
C. Twenty-three
D. One hundred and twenty-one
即学即练
A
D
Summary
four point nine six
one thousand and one point five four
.
.
.
thirty-four point zero eight
考点06：数词表示小数
小数点前的数按照基数词读，小数点读作point。
小数点后的数，按照个位基数词逐个读。
“.” point
写出下列数字的表达
7.29
10.56
628.1345
即学即练
seven point two nine
ten point five six
six hundred and twenty-eight point one three four five
Summary
one percent
fifty percent
one hundred percent
考点07：数词表示百分数
“%”
读作
percent
百分数读法：基数词+percent
写出下列数字的表达
5%
52%
87%
126%
即学即练
five percent
fifty-two percent
eighty-seven percent
one hundred and twenty-six percent
Summary
真题演练
1. We get up at ____ in the morning and go to bed at____ at night.
A. fifteen past six; four minute to nine
B. a quarter past six; four to nine
C. a quarter passed six; four-minute to nine
D. six fifteen; four to nine o’clock
2. The Mississippi is ____ kilometers long.
A. six thousand, two hundred, sixty-two
B. six thousands, two hundreds and sixty-two
C. six thousand and two hundreds and sixty-two
D. six thousand, two hundred and sixty-two
B
D
真题演练
3. It took _____ people three months to build this
great building.
A. two hundreds B. hundred of
C. hundreds of D. two hundred of
4. Tony’s mum looks young and beautiful. It’s hard to
imagine she is already in her _____.
A. fifties B. fifty C. fiftieth D. fiftieth
C
A
真题演练
5. Basketball is so exciting that _____ people play
it for fun.
A. million B. two millions
C. million of D. millions of
6. Helen loves reading. She has read _____ books
this month.
A. five B. fifth C. five of D. fifth of
D
A
真题演练
. He always wanted to have _____ of books and
he has recently bought four _____ .
A. hundreds; hundreds
B. hundred; hundred
C. hundreds; hundred
D. hundred; hundreds
8. I was 8 years old when my father was 31. This year
my father is twice my age. How old am I ______
A. 21 B. 22 C. 23 D.24
C
C
Summary
1.掌握数词的表示方法
2.掌握时间表达方法
3.掌握不确切数目的表达方法
4.掌握人的不确切年龄的表达方法
5.掌握算式，小数，分数表达方法