Numbers in a paragraph

Spell out whole-number words for one to ten; use figures for numbers above ten.

• EXAMPLE: There were two people ahead of me, and six behind me.
• EXAMPLE: I need to buy Christmas presents for 12 people this year.

If there are two or more numbers in one sentence, please use either words or figures for easy reading.

• EXAMPLE: Our University has five faculties and more than fifty departments.
• EXAMPLE: Our University has 5 faculties and more than 50 departments.
• AVOID: Our University has five faculties and more than 50 departments.

If there are a lot of numbers in one paragraph or text, some above ten and some below, use figures throughout to allow easy comparison by readers.

• EXAMPLE: There were 2 people ahead of me, and 22 behind me. The queues for other advisors had 10, 3 and 12 people.

Spell out words for ‘first’, ‘second’ and so on up to and including ‘tenth’; use numbers and ‘st’/ ‘nd’/ ‘rd’/ ‘th’ for larger ordinal numbers. Don’t use superscript (to prevent problems with line spacing).

• EXAMPLE: She was the first person from her family to go to university. 
• EXAMPLE: The 44th president of the United States was Barack Obama.

With hundred and thousand there is a choice of using figures or words:

• EXAMPLE:  300 or three hundred 
• AVOID:  3 hundred
• EXAMPLE:  EUR 3,000 or three thousand euros
• AVOID: EUR 3 thousand

Note that the numbers 1 through 10 are not spelt out in the following cases: seconds, minutes, hours, days, weeks, months, years, but two decades, three centuries.

As a rule, avoid combining single-digit figures and words using hyphens

• AVOID:  a 2-hour journey, but write out instead:
• EXAMPLE:  a three-year period; the four-minute mile

NOTE: some set phrases do use numbers

• EXAMPLE: a 40-hour week, a 24-hour clock

When two numbers are adjacent, spell out one of them:

• EXAMPLE: 90 fifty-gram weights, seventy 25-cent stamps

A sentence starting with a figure will often look out of place. Consider writing it out in full or inverting the word order.

• EXAMPLE:  During 1992 ..., altogether 92 cases were found...

However, a sentence beginning with a percentage may start with a figure:

• EXAMPLE:  ‘32 % of the funds ...’

References

Language Boutique 'Writing Numbers – Periods or Commas?' Retrieved from https://language-boutique.com/lost-in-translation-full-reader/writing-numbers-points-or-commas.html

University of Oxford Style Guide 'How to write numbers'. Retrieved from https://www.ox.ac.uk/sites/files/oxford/media_wysiwyg/University%20of%20Oxford%20Style%20Guide.pdf