1 = un
2 = dau (m) / dwy (f)
3 = tri (m) / tair (f)
4 = pedwar (m) / pedair (f)
5 = pump
6 = chwech
7 = saith
8 = wyth
9 = naw
10 = deg
20 = dau ddeg
30 = tri deg
40 = pedwar deg
50 = pum deg
60 = chwe deg
70 = saith deg
80 = wyth deg
90 = naw deg
100 = cant
1000 = mil
1 000 000 = miliwn
1 000 000 000 = mil miliwn
Vigesimal system
20 = ugain
30 = deg ar hugain
40 = deugain
50 = hanner cant
60 = trigain
70 = deg a thrigain
80 = pedwar ugain
90 = deg a phedwar ugain
100 = cant