- Decimal points
Use a point, not a comma, before a decimal.
0.25 5.5 - Commas
In numbers of one thousand or more, use commas between groups of three digits.2,436 32,548 83,200,000
Do not use commas in serial numbers such as page numbers, street numbers and years.
This idea receives further comment on page 1056 of the report. All further enquiries should be made at our office at 1558 Brunswick Avenue, New York City. The University of Bologna is the world’s oldest university; it was founded in 1088. - Hyphens
Hyphenate compound numbers from twenty-one to ninety-nine.Three hundred and forty-six students are enrolled in the School of Fine Art.
Spell out numbers that are joined to a word by a hyphen, except in the case of set phrases such as 24-hour clock and 24-7 service.A five-year period A one-week holiday
When two numbers appear side by side, spell one of them out. If one of them occurs alongside a unit of measurement, make that one a numeral.four 6-week periods thirty-six 20-cent coins
Recommended citation:
«Numbers and punctuation» [en línia]. A: Llibre d’estil de la Universitat de Barcelona. Barcelona: Universitat de Barcelona. Serveis Lingüístics. <https://www.ub.edu/llibre-estil/criteri.php?id=2377> [consulta: 7 novembre 2025].