2.9 Unit 2 Numbers More practice（课件）

(共29张PPT)
Unit 2 Numbers
More Practice
牛津深圳版　八年级上册
Before the invention of written numbers, people used many different ways to count things.
What tools did people use to
count things
Brainstorm
1
课堂导入
one
two
three
four
seven
eight
nine
ten
ten
five
six
How to use your fingers to count numbers
fingers
stick 棍子
toes
Tools to count numbers
abacus
Tools to count numbers
written number system
书面数字系统
token 陶筹
clay 黏土
Before the invention of written numbers, people used many different ways to count things.
At first, people used their fingers, and even their toes. However, they could only count small numbers in this way.
After that, they began to make small marks on sticks and bones. This helped them count bigger numbers. They used them to count things like the days of the month, the amount of food and the number of animals they had. Then people began to use tokens made from
clay or small stones. This helped them count even bigger numbers.
They often put the tokens on pieces of string so that they could carry them
around easily. This developed into tools like the abacus.
Finally, people began to develop systems of written marks to show different
numbers, and. This led to the Hindu-Arabic system (0—9). We are still using
this system today.
Read the article.
2
课堂活动
This article mainly talks about the ____________ of counting methods.
difference
development
design
skimming
Before the invention of written numbers, people used many different ways to count things.
Finally, they began to develop(4)______________________
This led to (5)_______________________________
used their fingers, and even their toes.
small marks on sticks and bones.
First, people used(1)___________________________________
After that, they made(2)_______________________________
Then they used(3)_____________________________________
tokens made from clay or small stones.
systems of written marks.
the Hindu-Arabic system(0-9).
A Read the online article and then complete the flow chart about the development of counting methods.
scanning
Step 6：Intensive reading
could
count
At first
small numbers
used
fingers and toes
At first, people used their fingers, and even their toes. However they could only count small numbers in this way.
Intensive reading
After that, they began to make small marks on sticks and bones. This helped them count bigger numbers. They used them to count things like the days of the month, the amount of food and the number of animals they had.
After that
began to
make
marks on sticks and bones
helped…
count
bigger numbers
like
the days of the month
the amount of food
the number of animals
Intensive reading
Then people began to use tokens made from clay or small stones. This helped them count even bigger numbers. They often put the tokens on pieces of string so that they could carry them around easily. This developed into tools like the abacus.
Then
began to
use
to count
even bigger numbers
put…on…
developed into
tokens made from clay or small stones
tools
Finally, people began to develop systems of written marks to show different numbers, and this led to the Hindu-Arabic system (0-9). We are still using this system today.
Finally
began to
develop
to show
different numbers
led to
systems of written marks
Hindu-Arabic system
Intensive reading
However, they could only count small numbers in this way.
This helped them count bigger numbers.
This helped them count even bigger numbers.
Intensive reading
What does this refer to
Using their fingers and even their toes
Making small marks on sticks and bones
Using tokens made from clay or small stones
This developed into tools like the abacus.
… and this led to the Hindu-Arabic system (0~9).
We are still using this system today.
What does this refer to
This often refers to something mentioned before.
Intensive reading
Putting the tokens on pieces of string
Developing systems of written marks
The Hindu-Arabic system
1. They used them to count things like the days of the
month, the amount of food and the number of animals they had.
人们利用它们来数数，像每个月的天数，食物的数量还有他们所拥有的牲畜的数目。
amount 用作名词，意为“数量；总额”，通常用于a (great / large) amount of 短语中，表示“大量；许多”，其后通常接不可数名词。
例如： 他赚了很多钱。
He made a large amount of money.
Language points
注意the amount of 和the number of 的区别：
这两个短语都表示“……的数量”，其区别在于:前者与不可数名词连用，而后者与可数名词的复数形式连用。例如:
降雨量影响农作物的生长。
The amount of rain affects the growth of crops.
在过去的五十年里，老虎的数目锐减。
The number of tigers has reduced sharply in the last fifty years.
2. They often put the tokens on pieces of string so that they could carry them around easily.
他们经常把代币悬在绳子上，这样他们可以轻松地四处携带它们。
【句型】
so that 引导目的状语从句时，意为“以便；为了”，
从句中常使用can，could，may 等情态动词。注意，so ... that ...引导的是结果状语从句，意为“如此……以至于……”，试比较：
为了赶上早班车，他今早很早就起床了。
He got up early this morning so that he could catch the early bus.
他今早起得太晚了，以至于错过了早班车。
He got up so late that he missed the early bus this morning.
3. ... and this led to the Hindu-Arabic system (0-9).
……然后这最终形成了阿拉伯数字系统。
lead to 可表示：
(1) (道路)等通往……。例如：条条道路通罗马。
All roads lead to Rome.
(2) 引起(结果等)；导致。
常见搭配：lead to + n. / v.-ing。
那场大雨引起水灾。
The heavy rain led to a flood.
懒惰导致考试的失败。
Laziness leads to failing the exam.
注意以下搭配：
lead sb to some place 把某人带到某地
lead sb to do sth 带领某人做某事
Numbers around the world
People around the world write numbers in different ways. The following shows how people from different cultures write one to five.
Chinese: 一、二、三、四、五
Romans: I, II, III, IV, V
English: one, two, three, four, five
However, most people around the
world use Arabic numbers
(1, 2, 3, 4, 5, etc.) today.
Culture corner
Romans
Chinese
English
Arabic numbers
Numbers around
the world
Project
A In groups, brainstorm some topics about numbers. Use the following spidergram to help you.
A mini-encyclopaedia of numbers
C In groups, write a short article on your topic. Follow the example.
3
课堂小结
1，We have learned about the development of counting methods.
2, We have learned people around the world write numbers in different ways. such as :Chinese Romans English and Arabic numbers.
一、选择最佳答案填空。
( ) 1. We will only have a ____ examination this time.
A. write B. wrote C. writing D. written
( ) 2. Peter can use some different ways ____ out the problems.
A. work B. to work C. working D. worked
( ) 3. I think I can study English well ____.
A. in this way B. on the way C. by the way D. on my way
( ) 4. He studies English ____ better than me.
A. very B. so C. quite D. even
D
B
A
D
4
课堂训练
6. —How often should I take the pills, Dad
—_________(Two) a day.
7. We have enough money __________(buy) a new bike.
8. Please teach me how _________(fly) kites.
9. Human beings ever used tools _________(help) them work.
10. There are many traffic ___________(accident) in China every day.
Twice
to buy
to fly
to help
accidents
二、用所给词的适当形式填空。
谢谢
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