- Cardinal numbers
Spell out cardinal numbers from zero to nine and use numerals from 10 upwards, but maintain consistency in the immediate context.
Every three sessions, the students will be organized in new groups of five. The Board will be reviewing a total of 10 new master’s degrees and 12 new doctoral degrees. The presentations should last between five and ten minutes.
Note that apart from its use in calculations, dates, lists, etc., the concept of zero is usually expressed with the word no, instead of the numeral 0.There were no students in the classroom. - Ordinal numbers
Spell out ordinal numbers from zero to nine and use numerals from 10 upwards, but maintain consistency in the immediate context. Avoid superscript type.The Second International Conference on Fluid Dynamics was held in Vic. The oldest European university was founded in the 12th century. In this year’s ranking table, the research groups Pattern Analysis and Sonar Imaging occupied third and eleventh position, respectively. - Roman numerals
Use Roman numerals for course names.Mathematics II - Fractions
Spell out fractions and hyphenate them when you use them as adjectives.A two-thirds majority vote is required to approve the proposal.
However, avoid hyphens when the fraction is used as a noun.Two thirds of the students were in agreement. The lecturer has covered three quarters of the course so far. - Numbers at the beginning of a sentence
Spell out numbers (including years) at the beginning of a sentence, although it is better to rewrite the sentence so that it does not start with a numeral.Nineteen forty-five was the year the UN was founded. The UN was founded in 1945. - Plural numbers
Add an s to form the plural of a numeral. Do not add an apostrophe.Among the scores were four 94s and two 99s.
Recommended citation:
«Writing out numbers» [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=2376> [consulta: 7 desembre 2025].