I (one)
unus, a, um
II (two)
duo, duae, duo
III (three)
tres, tres, tria
IV (four)
quattuor
V (five)
quinque
VI (six)
sex
VII (seven)
septem
VIII (eight)
octo
IX (nine)
novem
X (ten)
decem
XI (eleven)
undecim
XII (twelve)
duodecim
XIII (thirteen)
tredecim
XIV (fourteen)
quattuordecim
XV (fifteen)
quindecim
XVI (sixteen)
sedecim
XVII (seventeen)
septendecim
XVIII (eighteen)
duodeviginti
XIX (nineteen)
undeviginti
XX (twenty)
viginti
L (fifty)
quinquaginta
C (a hundred)
centum
D (five hundred)
quingenti, ae, a
M (a thousand)
mille