课件26张PPT。Numbers Please tell us one of your favorite number and explain the reason.
Review and questions Brainstorming When and where we may use numbers?Before you read the passage, look at the following pictures first. Put them in the order of the history of numbers. Then look at the headings on page 57 and check your answers. 0The history of numbers0Ancient numbersZeroCalculating machinesBrain against computer0123456Tasks1 Are ancient numbers the same?
2 Find the smallest and the biggest numbers.
3 The first calculating machines
4 What is called a living computer? Ancient numbers Greek Numerals (希腊数字)Roman Numerals (罗马数字) Ancient numbers Chinese Numerals (中国数字) Ancient numbers Egyptian Numerals (埃及数字) Ancient numbers Task 1: Are ancient numbers the same?ChinaGreeceRome Egypt in different ways _____in the same way in tenscount Ancient numbersTask 2 : Find the smallest and the biggest numbers Who invented and developed 1-9 system of numbers?
Why is zero very important? It made it easier to write big numbers and to calculate.The IndiansZeroAncient Numbers and Number SystemMay is asking Mr Li, the writer, some questions about his article on numbers. Ancient Numbers and Number SystemYes, it wasBecause zero made it easier to write big numbers and to calculate.The IndiansZero1An accurate ancient calculating machine that is still used today.An ____________.abacusvery correctTask 3: The first calculating machinesCalculating machines2A small machine that uses
electronic power to do calculations.A ____________.calculatorOther calculating machinessquare rootan electronic calculatorwatchdictionary percentage/p?'sent??/3A very powerful machine for doing calculations in a flash.A ____________.computerwith great powervery quicklyOther calculating machinesadd
subtract
multiply
dividedo some calculations12341 x 9 + 2 = 12 x 9 + 3 = 123 x 9 + 4 = 1234 x 9 + 5 =11111111111111/s?b'tr?kt//'m?lt?pla?//d?'va?d/Mr. Li: Which calculating machine do you
like best?
S1: I like________ best, because ______.
How about you, Mr. Li?
Mr. Li: ______ is my favourite because ______.
Calculating machinesAn Indian lady & computers They were given this problem
to solve.50 secondsa minute What is called a living computer?like lightning Shakuntala Devi Brain against computerMr. Li is working hard on the report of the amazing girl, Shakuntala Davi. Please help him out.Brain against ComputerThe girl with _____________ once had a competition between a __________. It took her _________(duration) to work out the answer while the computer took _______(duration) with the help of __________ before. Therefore, the girl _____ the competition.
Gender: _____Name: _______________Nationality: ________Shakuntala DeviFIndianan amazing braincomputer50 seconds1 minuteprogrammingwon_____ is more powerfulThinking :Advantages The Advantages of
the BRAINThe Advantages of
the COMPUTERNo p_____________ neededNo e_____________ neededBetter at imaginationBetter at understanding the outer world and coming up new ideasMore c___________Smaller and smallerS______more timeBetter at doing many difficult tasks at the same timerogramminglectricityonvenientavingA conversation between ancient people and modern people Make a conversation among four students about numbers.
S1: We come from ancient time. What do you use to do calculations?
S2: We come from modern time. Are numbers invented by you?
……NumberN--
U--
M--
B--
E--
R--NumerousUsefulMeaningful Beautiful Effective
RegularHomeworkWrite a composition
______ is more powerful.Numbers 课堂练习
Ⅰ. Before you read the passage, look at the following pictures first. Put them in the order of the history of numbers. Then look at the headings on page 57 and check your answers.
/
（ ） （ ） （ ） （ ） （ ）
Ⅱ. May is asking Mr Li, the writer, some questions about his article on numbers.
1
Mr Li:
May:
Mr Li:
Everyone knows it.
Knows what?
The language of numbers.
2
Mr Li:
May:
Mr Li:
Long ago, people wrote them in many different ways.
Wrote what?
___________.
3
Mr Li:
May:
Mr Li:
People all count in this way.
In what way?
___________.
.........
4
Mr Li:
May:
Mr Li:
Who added one more number to the system?
___________.
What number did they invent?
___________.
