Unless they belong to a figure (1½), always spell out and hyphenate fractions.
 | The report shows that one-third of all undergraduates use campus parking facilities. |
Recommended citation:
«Fractions» [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=2271> [consulta: 26 abril 2024].