Cardinal ordinal English key element
1 unus primus one un/prim
2 duo secundus/alter two duo/alter
3 tres tertius three tre/tert
4 quattor quartus four quat/quart
5 quinque quintus five quin
6 sex sextus six sex
7 septem septimus seven sept
8 octo octavus eight oct
9 novem nonus nine nov/non
10 decem decimus ten dec
100 centum centesimus hundred cent
1000 mille millesimus thousand mille