Type of Number

Number of Digits

Format

Mobile telephone
numbers

Difficult to say,
probably 
between 8 to 10

 Will be prefixed by '0'

Land telephone
numbers

Again difficult to say, between 
4 and 10

Normally prefixed by a '0'

Telephone numbers
abroad

Will have more digits
than a number
in-country

Prefixed by '001' and the country 
code, normally 2 digits 

A postcode in Australia

Between four to
five digits

Together

A postcode in the UK

Digits and letters, normally 
3 or 4 digits &
3 or 4 letters

Seperated into 2 parts: letter(s) 
+ digit(s) and letter(s) + digit(s)

Short-term dates 
(a few days or weeks)

 Between 2 & 4

Normal UK or Aus format: date+month 

(not the US version of month+date)
- might also have a day-name included

Long-term dates 
(months or years)

Between 3 & 6

Normal UK or Aus format: 
date+month+year

Duration of time 
(eg: how long a 
journey takes)

Depends on what kind 
of journey (long/short 
& type of transport

Normally will be a few hours, or possible
weeks or even months for journeys by sea

A person’s age

One or two. 
Possibly 3, 
but not likely

Together