English – Welsh
one – un
two – dau (m) / dwy (f)
three – tri (m) / tair (f)
four – pedwar (m) / pedair (f)
five – pump
six – chwech
seven – saith
eight – wyth
nine – naw
ten – deg
eleven – un deg un
twelve – un deg dau
thirteen – un deg tri
fourteen – un deg pedwar
fifteen – un deg pump
sixteen – un deg chwech
seventeen – un deg saith
eighteen – un deg wyth
nineteen – un deg naw
twenty – dau ddeg
twenty five – dau ddeg pump
thirty – tri deg
forty – pedwar deg
fifty – pum deg
sixty – chwe deg
seventy – saith deg
eighty – wyth deg
ninety – naw deg
one hundred – cant
two hundred – dau gant
three hundred – tri chant
four hundred – pedwar cant
five hundred – pum cant
six hundred – hwe chant
seven hundred – saith cant
eight hundred – wyth cant
nine – hundred – naw cant
