Transcript chapter4 numbers (10-09-30)

Chapter 4
The world of numbers
How do you read the numbers?
credit card 信用卡
ID card 身份证
a postal code 邮编
2 4 6 8 10
even numbers
偶数
sports suit 球衣
odd
numbers
1 3 5 7 9
奇数
a fraction 分数
three fifths
chart 图表
a percentage 百分数
100% : one hundred percent
thermometer 温度计
angle(角度)
degrees （度数）
37 degrees
90 degrees
a receipt 收据
a decimal number 小数
point 点
hundred 百
thousand 千 million 百万
II. Using numbers(数词的使用)
Ho
w
to
re
a
d
1.Terms for mathematics(数学术语)
=
equal / is
0
zero
＋
plus
－
minus
×
times
÷
divided by
50%
fifty percent (百分数)
Percentages (百分数 ）
12%
twelve percent
68%
sixty-eight percent
Please read the following:
90%, 86%, 5.6%
1.8
one point eight
Decimal numbers( 小数)
0.65
8.08
zero point six five
eight point o eight
Please read the following:
7.65, 0.09, 86.20
2/3
two thirds(分子为基数词
分母为序数词)
Fractions (分数）
1/3
2/5
one- third
two-fifths
Please read the following:
2/5, 1/6, 3/7,
forty-five degrees (度)
45°
Degrees (度的读法)
90°
ninety degrees
36. 6° thirty-six point six
degrees
Please read the following
27°, 31°, 100°
1 3 5 7 9
odd numbers(奇数)
2 4 6 8 10
even numbers (偶数)
Years/Months/Dates （日期）
Hours/Minutes/Seconds（时分秒）
1) 1990 nineteen ninety
2001 two thousand and one
2) Jan. Feb. March April May June
July Aug. Sep. Oct. Nov. Dec.
3) Sun Mon Tue Wed Thu Fri Sat
Time
（31~59分）
(60-分钟) to(小时+1)
5:15
6:30
2:07
3:50
（1~30分）
(分钟)past(小时)
five fifteen; a quarter past five
six thirty ; half past six
two o seven; seven past two
three fifty; ten to four
Please read the following
11:20, 3: 45; 4:30
约数的读法
数十个
tens of
数以百计
hundreds of
数以千计
thousands of
数以百万计 millions of
hundreds of students
millions of years ago
IIII. Group work
（数字分类）
0.54
50%
213
79
852
25°
7.7
3/7
21.13
420
40°
1,000
76%
160 ° 7/9
3/5
75%
2005
1. Even numbers(偶数)__________________________
420
1000
852
213
2. Odd numbers(奇数)___________________________
79
2005
3/5
3/7
7/9
3. Fractions(分数)_______________________________
76% 75% 50%
4. Percentages(百分数)___________________________
160° 40° 25°
5. Degrees(度数)________________________________
6. Decimal numbers(小数)________________________
7.7
21.13 0.54
166 one hundred and sixty six
1502 one thousand, five hundred
and two
36% thirty six percent
0.75 zero point seven five
5.05 five point o five
41° forty one degrees
27° twenty seven degrees
2006 two thousand and six/
1/5
3/5
two o o six
one-fifth
three-fifths
IV How
to
calculate
plus , ( ＋ 加）
Q: How to say “4 + 12 =?”
What’s 4 plus/and 12?
3＋５＝8
3 plus 5 is 8.
Please read the following:
5+6 =? 9+10 =?
minus (减）subtract (减)
Q: How to say “5 - 2 =?”
What’s 5 minus 2?
12 – 3 = 9
12 minus 3 is 9.
Please read the following:
2-2 = ? 20-10 =?
times; multiply (×乘)
２ × ３ ＝６
2 times 3 is six.
Please read the following:
5×3 =? 20×5=?
divide (÷除)
30÷ 6 = 5
What’s 30 divided by 6?
30 divided by 6 is 5.
How to say:
Please read the following
20÷2 =? 8÷2 =?
tiger
bear
pig
duck
＋
plus
=
equals / is
×
times
=
equals / is
÷
divided by
=
equals / is
minus
equals / is
抢答题
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1. There is a number 6.
2. Now add 2.
3. Multiply the answer by 2.
4. Now add 4.
5. Now divided by 2 .
6. Now subtract 10.
7. Now tell me the answer.
zero
Rules:
1.Everybody gets a card.
2.Teacher says out a number or asks you
to calculate.
E.g. 21
2
1
3. If you have the card, come to the front
and show it to us in order(按顺序).
4. The quicker group is the winner.
V. Queue competition 列队比赛
Listen and find out the answers
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1. A. 80
2. A. 2.66
3. A. $ 75
4. A. 56
5. A. 1/8
B. 49
B. 26%
B. 75%
B. 65
B. 0.75
C.17
C. 2/3
C. 75 °
C. 33
C. 33
VII. Summary
1. How to read the numbers
and signs.
=
＋ － × ÷
1.8 50% 2/3 45 °
odd numbers(奇数)
even numbers (偶数)
2.How to calculate
the numbers
3 plus 6 6 minus 3 times
3 is 3.
6 is 18.
is 9.
6 divided
3 by is 2.