Numbers
(1) Introduction
In business and technical writing, numbers form a major part of our written texts. Therefore, it is important to bear in mind a few elementary rules of style, which will help to ensure both consistency and clarity when using written numbers.
 Numbers below ‘ten’ should be written out in words. There are, however, two exceptions to this rule:
1. page numbers
2. units of measurement
There are three ways to generate revenue
Page 6 outlines the main steps that need to be taken
The device has a 4inch screen and weighs only 9 ounces  If a sentence begins with a number, write out the number in words:
Thirtyfive people have been interviewed for the position of CFO this month  If this feels awkward or unnatural, then revise the sentence:
This month we have interviewed 35 people for the position of CFO  If you need to use lots of complex numbers, put them in listform to make them easier to read, for example:
1. 2691
2. 4378
3. 1892
4. 6581  Use the following convention when you write dates. Be consistent in using it:
Until the 7^{th} of May 2010 the supply of bananas will be uncertain in some areas
(2) Cardinal and Ordinal Numbers
Numbers that express quantity, “three secretaries”, “500 branches” are written and pronounced as ‘cardinal numbers’ (see left of chart below). When you need to express the sequence or order of an event, remember to use ‘ordinal numbers, (see right of chart below). We use ordinal numbers for dates*, comparative results, gradings and league tables. (*for variations of datewriting styles, see below)
Cardinal

Ordinal


1

One

1st

First

2

Two

2nd

Second

3

Three

3rd

Third

4

Four

4^{th}

Fourth

5

Five….

5^{th}

Fifth

11

Eleven

11^{th}

Eleventh

12

Twelve

12^{th}

Twelfth

13

Thirteen

13^{th}

Thirteenth

14

Fourteen

14^{th}

Fourteenth

15

Fifteen

15^{th}

Fifteenth

20

Twenty

20^{th}

Twentieth

21

Twentyone

21st

Twentyfirst

22

Twentytwo

22nd

Twentysecond

30

Thirty

30^{th}

Thirtieth

40

Forty

40^{th}

Fortieth

50

Fifty

50^{th}

Fiftieth

60

Sixty

60^{th}

Sixtieth

70

Seventy

70^{th}

Seventieth

80

Eighty

80^{th}

Eightieth

90

Ninety

90^{th}

Ninetieth

100

One hundred

100^{th}

One hundredth

Exercise (see answers below)
Write down the following numbers:
a. The thirtieth of June
b. Three point one four two
c. Four oh six, three doublenine
d. One thousand two hundred and three
e. Nineteen thirtynine
f. Ninety
g. The nineteenth century
h. Seven and a half percent
i. Eleven forty five
j. Four thousand nine hundred and two
Answer key:
a. the 30^{th} of June b. 3.142 c. 406399 d. 1,203 e. 1939 f. 90 g. the 19^{th} century h. 7.5% i. 1145 j. 4,902
(3) Writing Dates
European and American styles of date writing are quite different and you need to pay attention in order to avoid confusion in transatlantic communication:
 In the US, the 1^{st} day of April is written as 4/1/2010.
 To a European, this looks like the 4^{th} day of January.
 The Americans place the month before the day.
 In Europe, April Fools Day is written as 1.4.2010.
 To avoid this confusion, write out the date as April 1^{st} 2010.
(4) Prefixes expressing numbers
Here are two lists of prefixes expressing numbers. One list comes from Latin and the other from Greek. What words do you know that begin with these prefixes?
No.

Latin

Greek

Meaning

1

Uni

Mono

One

2

Bi

Di

Two

3

Tri

Tri

Three

4

Quart

Tetra

Four

5

Quint

Penta

Five

6

Sex

Hexa

Six

7

Sept

Hept

seven

8

Oct

Oct

Eight

9

Non

Ennea

Nine

10

Dec

Dec

Ten

11

Cent

Hecto

Hundred

12

Mil

Kil

Thousand

13

Semi

Hemi

Half
