Numbers give us a great opportunity to bust a myth that Gaelic is more complicated than English. The teens are easier in Gaelic than English. The only thing you need to remember is to lenite after dà!
aon-deug
eleven
dà-dheug
twelve
trì-deug
thirteen
ceithir-deug
fourteen
còig-deug
fifteen
sia-deug
sixteen
seachd-deug
seventeen
ochd-deug
eighteen
naoi-deug
nineteen
fichead
twenty