Module 1 Unit 2 Numbers More practicer课件 (共14张PPT)

(共14张PPT)
Unit 2 Numbers
More practice
Counting before numbers
What do these pictures refer to
Warming-up
Nicholas
Designer
Cameron
Designer
numbers
abacus
算盘
[ b k s]
fingers and toes
tokens made from clay or small stones
small marks on sticks and bones
Brainstorming
Brainstorming
If there were no counting numbers, how can we count things
代币
fingers and toes
tokens made from clay or small stones
small marks on sticks and bones
Predicting
Can you guess the order of their occurring time
Skimming
This article mainly talks about the ____________ of counting methods.
difference
development
design
Scanning
Scan the article and then complete the flow chart about the development of counting methods.
First, people used _______________________________.
After that, they made _________________________________.
Then they used__________________________________.
Finally, they began to develop_____________________.
This led to ________________________.
their fingers and even their toes
small marks on sticks and bones
tokens made from clay or small stones
systems of written marks
the Hindu–Arabic system
fingers and toes
tokens made from clay or small stones
small marks on sticks and bones
Scanning
The order of their occurring time
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.
People used many different ways to count things.
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
Intensive reading
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
2
3
4
1
Intensive reading
What does this refer to
5
6
We are still using this system today.
This helped them count even bigger numbers.
However, they could only count small numbers in this way.
This helped them count bigger numbers.
This developed into tools like the abacus.
… and this led to the Hindu-Arabic system (0~9).
Using their fingers and even their toes
Making small marks on sticks and bones
Using tokens made from clay or small stones
Putting the tokens on pieces of string
Developing systems of written marks
The Hindu-Arabic system
This often refers to something mentioned before.
retelling
fingers and toes
small numbers
(small) marks on sticks and bones
bigger numbers
tokens made from clay or small stones
even bigger numbers
systems of written marks
the days of the month
the amount of food
the number of animals
the Hindu-Arabic system (0-9)
the abacus
development
more and more advanced
different
numbers
At first,
Then,
After that,
Finally,
Culture corner
People around the world write numbers in different ways. The following shows how people from different cultures write one to five.
Chinese:
English:
Arabic:
Romans:
However, most people around the world use Arabic numbers (1,2,3,4,5,etc) today.
一，二，三，四，五……
One, two, three, four, five……
1,2,3,4,5……