(共6张PPT)
Listening and writing
Peiod 4
Preview
Read them out
342,786,500+ 574,375,060
1/4 of 10,900,300
3/4 of 60,853,200
85% of 845,259,605
0.56 0.69
Listening
Aim
Apparatus
Method
To find out if there’s a change in weight when magnesium burns in air.
Magnesium, Bunsen burner, a balance, a crucible.
First, put the magnesium in the crucible. Then put the crucible on the balance and weigh it. Next ,heat the magnesium. Light the Bunsen burner and hold the crucible over it. Finally, weigh the magnesium again.
Listening
Result
Conclusion
It weighs a little more than before.
There is a change in weight when magnesium burns in air.
Function
work in pairs
1) What do you do first when you get home
2) What do you do next
(Please describe what do you do after you get home, using the words above.)
First then next after that lastly(共9张PPT)
Vocabulary and Speaking
Peiod 2
1. Cardinal numbers （基数）
0 5 11 12 23 34 48
109
256
1,000 11,000 20,000
100,000
1,000,000 2,300,000
16,500,709
1,000,000,000
20,000,000,000
one hundred and nine
two hundred and fifty-six
one hundred thousand
twenty thousand
two point three million
twenty billion
sixteen million, five hundred thousand, seven hundred and nine
two million, three hundred thousand
Find the two mistakes
52,470,383 fifty-two million, four hundred and seventy, three hundred and eighty-three
100,000,000 hundred million
365,528,462 three hundred and sixty-five million, five hundred and twenty-eight
1,000,000,000 one thousand million / one billion
thousand
a/ one
2. Fractions rules
A fraction is made up of three parts—the numerator(分子), a horizontal or italic line and the denominator(分母).
First read the numerator with a cardinal number and then read the denominator using an ordinal number(序数) which must be in its plural form except when the numerator is one.
3. Percentages
Change these fractions into percentages.
fractions percentages We say
1/4
4/5
1/10
3/4
1/2
2/5
25%
80%
10%
75%
50%
40%
forty percent
a half/ fifty percent
seventy-five percent
ten percent
eighty percent
twenty-five percent
4. Decimals
Fractions Decimals We say
1/2
2 1/4
3/4
30 1/2
12 3/10
12.3
30.5
0.75
2.25
0.5
point five ( zero point five)
two point two five
point seven five
thirty point five
twelve point three
Vocabulary
Words consolidation
Activity 5 on P92
Exercise 8 on P93
