a haon - one - 1
a dó - two - 2
a trí - three - 3
a ceathair - four - 4
a cuig - five - 5
a sé - six - 6
a seacht - seven - 7
a hocht - eight - 8
a naoi - nine - 9
a deich - ten - 10
a haon déag - eleven - 11
a dó dhéag - twelve - 12
a trí déag - thirteen - 13
a ceathair déag - fourteen - 14
a cúig déag - fifteen - 15
a sé déag - sixteen - 16
a seacht déag - seventeen - 17
a hocht déag - eighteen - 18
a naoi déag - nineteen - 19
fiche - twenty - 20