Module 5 A lesson in a lab Module 5 A lesson in a lab.

Module 5A lesson in a

lab

Module 5A lesson in a

lab

Can you say the following in English

correctly?

1,000

2,000

12,000

112,000

796,000

one thousand

two thousand

twelve thousand

one hundred , twelve thousand

seven hundred ,ninety-six thousand

879,457

eight hundred, seventy-nine thousand,

four hundred and fifty-seven

1,000,000

9,000,000

32,000,000

212,000,000

one million

nine million

thirty-two million

two hundred ,twelve million

988,766,688

nine hundred ,eighty-eight million ,seven

hundred, sixty-six thousand ,six

hundred and eighty-eight987,654,321nine hundred ,eighty-seven million, six

hundred,fifty-four thousand, three

hundred and twenty-one

1,000,000,000 one billion

9,000,000,000 nine billion

32,000,000,000 thirty-two billion

564,865,000,000

five hundred, sixty-four billion, eight

hundred, sixty-five million

978,876,675,467

nine hundred, seventy-eight billion, eight

hundred,seventy-six million , six hundred

,seventy-five thousand , four hundred

and sixty-seven

Let’s have a match to say who can

say the following numbers correctly

and quickly.

1. 765,847

seven hundred ,sixty-five thousand,

eight hundred and forty-seven

practice

2. 756,980,000

seven hundred ,fifty-six million, nine

hundred and eighty thousand

3. 345,567,887,987

three hundred ,forty-five billion, five

hundred, sixty-seven million, eight

hundred ,eighty-seven thousand, nine

hundred and eighty-seven

4. 897,786,000,576 eight hundred, ninety-seven billion,

seven hundred, eighty-six million, five hundred and seventy-six

5. 786,087,670,756 seven hundred, eighty-six billion,

eighty-seven million, six hundred, seventy thousand, seven hundred and fifty-six

6. 987,765,654,345

nine hundred eighty-seven billion,

seven hundred ,sixty-five million, six

hundred ,fifty-four thousand, three

hundred and forty-five

Read these questions aloud and say

the answers.

1. What is ½ of 6,000,000?

2. How much is 35,246,000 plus

12,800,000?

3. What is 25%of 200,000,000?

three million

forty-eight million , forty-six thousand

fifty million

4. How much is 260,408,396 5,284,700? two hundred, sixty-five million, six

hundred, ninety-three thousand, ninety-six

5. What is ¾ of 1,000,500,000? seven hundred, fifty million, three

hundred, seventy-five thousand 6. What is 10% of 800,000,000 ? eighty million

1/5

1/6

1/7

4/7

one fifth

one sixth

one seventh

four sevenths

Can you say the following in English

correctly?

7/10

97/111

seven tenths

ninety-seven one hundred and

elevenths

forty-five eighty-sevenths

总结 : 你能看出他们有什么特点吗？

45/87

分子用基数词 ,分母用序数词 ;分子大于1,分母的序数词需要加 s。

另外 , 还有几个特殊表达的情况 :

1/2

1/4

1/3

3/4

2/3

one half

one quarter

one third

three quarters

two thirds

Now let’s say:2/5 5/8 9/10 3/8 5/6

practice

Can you say the following in English

correctly?

Can you say the following in English

correctly?

0.5

0.8

0.76

1.23

point five

point eight

point seven six

one point two three

23.45

100.32

87.675

7.564

twenty-three point four five

one hundred point three two

eighty-seven point six seven

seven point five six four

Finish exercises 9 on P 93

Assignments today