课件19张PPT。Book1 Module5 Vocabulary and SpeakingActivity 1 Listen and find the numbers1.area:
2.population:
3.history: 12,000 km214,000,0003000years twelve thousand square kilometersforteen millionthree thousand years Activity 1 Listen and find the numbers4. (a)Two-thirds of the earth’s surface is water.
(b) 50% of the earth’s surface is water.5. (a) The distance of the sun from the earth is 25,500kilometres.
(b) The distance of the sun from the earth is 150,500,500 kilometres. 6. (a) The earth is 4.6 million years old.
(b) The earth is 4.6 billion years old.7. (a) The earth is twice as large as the moon.
(b) The earth is forty-nine times larger than the moon.
A quiz about natureActivity 1 Listen and find the numbersPress and ListenWe’re going to learn
1. large numbers(e.g. 150,500,500)
2. fractions (e.g. 2/3)
3. decimals (e.g. 4.6)one thousandten thousandone hundred thousand two millionfifty millionone hundred millionone billionCan you read the following numbers?Activity 2 Large numbers
1,203,456,700How to write this number?and and billionmillionthousandActivity 2 Large numbers
one billion, two hundred and three million, four hundred and fifty-six thousand, seven hundred
one billion two hundred and three million four hundred and fifty six thousand seven hundred
fifty-two million, four hundred and seventy thousand, three hundred and eighty-threefifty-two million, four hundred and seventy, three hundred and eighty-three There are two mistakes in the following numbers. What are they?hundred millionthree hundred and sixty-five million, five hundred and twenty-eight thousand , four hundred and sixty-twoone thousand million / one billion52,470,383100,000,0001,000,000,000365,528,462one/a hundred millionActivity 2 Large numbers
cardinal number
one,two,three...ordinal number
third, fourth, fifth...numerator分子?denominator分母What are the rules to say this kind of number?Activity 2 Fractions
Two thirds of the earth’s surface is water.We write
We say
two thirdsone ninthseven ninths1/97/92/3Can you say the following fractions in English correctly?
one/a halfa quarterthree quartersActivity 2 Fractions
three quartersone/a halffive eighths
Now let’s write:
5/8 1/2 3/4
PracticeActivity 2 Fractions
40%Two fifths is the same as forty percent.9/10=?90%Nine tenths is the same as ninety percent.2/5=?75%3/4=?1/4=? 25%Activity 2 Fractions
What is 1/2 of 1?0.50.511.511.051one point nought/zero five one point five; zero / nought point five(zero / nought)point five one one point five one Activity 3 Decimals
We writeWe say
1 1.73
A. one point seven three
B. one point seventy- three
C. one seventy-three 3 0.3%
A. zero point three
B. point three percent
C. zero point three percents2 1.4%
one point four percent
B. one point four percents
C. one point fourth percentChoose the right one.Activity 4 Decimals
We have learned
1. large numbers
2. fractions
3. decimalsWork out the answers to the questions as quickly as possible.
Then stand up to read the sentences and tell us your answers.
You will get some points according to your performance.Activity 5 Competition
What is 1/2 of 6,000,000?
1. How much is 35,246,000 plus 12,800,000?
2. What is 25% of 200,000,000?
3. What is 3/4 of 1,000,500,000?
4. What is 10% of 800,000,000?
3,000,000
1. How much is 35,246,000 plus 12,800,000?
48,046,000
2. What is 25% of 200,000,000?
50,000,000
3. What is 3/4 of 1,000,500,000?
750,375,000
4. What is 10% of 800,000,000?
80,000,000
A+B
A-B
A×B
A÷B Play this game with your classmates!A plus B is/equals... A minus B isA times/multiplied by B is A divided by B is Homework Work in pairs. Give your partner five sums. Use numbers over a million. Your partner must find the answers.
Practice it after class.
Some pairs will be invited to present your pair work in the next class.