In Ireland, Initial Teacher Education [ITE] standards require all teachers to possess an adequate level of numeracy themselves in order to teach for numeracy learning across the school curriculum. This paper reports on a study that investigated 204 pre-service post-primary teachers' numeracy capabilities. Analysis of questionnaire data from participants in three universities showed that pre-service teachers tend to struggle to complete the numeracy tasks correctly, especially tasks related to ratio and proportional reasoning. If pre-service teachers of all disciplines are not capable of completing core numeracy concepts, then they will struggle to teach for numeracy learning.