Numbers

There are many styles for presenting numbers on the Web:

spell out numbers up to nine
write all numbers 10 and above as numerals
use commas as appropriate for numbers greater than 999: 1,200,450 and 1,282
numbers that begin a sentence should be spelt out:
Forty-four years ago my parents arrived in Australia.
use numerals when the number modifies a unit of measure, time, proportion: 2 inches, 5-minute delay, 60 kph, 23 years old, page 23, 2%
use numerals for decimals and fractions: 0.75, 3.45, 1/2
approximate figures may be written out as words: a third of the time, four times as often
place a hyphen after a unit of measure when the unit modifies a noun: 2-metre shark,
6-centimentre rule, 3-year-old horse
use 40% rather than 40 per cent
page numbers: p 34
telephone numbers - present local numbers as 8123 4567 and international numbers as
+61 8 8123 4567.

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