Write all numbers 10 and over as numerals, up to 999,999.
Write numbers zero to nine as words unless they are technical or precise, such as dates, figure or table titles, or relate directly to the statistics being presented.
On the one hand…
This is the most effective of the two measures…
7 March 2017
Where a range crosses the 10 boundary, use numerals.
9 to 12 respondents, not nine to 12 respondents
Write out rankings first to ninth, then use numerals. Don’t use superscript for “st”, “nd”, “rd” and “th”.
A sequence of numbers should use the same format for both, which should follow the higher number.
6th out of 12
Don’t use abbreviations of “numbers”, such as “no” or “nos”. They can be read incorrectly.
Use commas after every three decimal places in numbers of four digits or more, and never spaces. Years should have no punctuation.
Avoid writing sets of numbers together.
In 1961 just over 2,500 births were recorded
In 1961 2,543 births were recorded
Use a 0 where there’s no digit before the decimal point in a number.
Don’t start a sentence with a numeral. Rearrange the sentence accordingly.
The number of people who drive a car is 52.4 million
52.4 million people drive a car
Don’t use a hyphen to indicate a range of numbers, separate with “to”.
Around 15 to 20 people attended the event.