Latin Numerals

Latin Numbers and Numerals

Latin or Roman numerals work by repeating and combining the following digits: I, V, X, L and C.

When a digit is repeated more than once, it is added. So II is 1+1 and III 1+1+1

A smaller digit is added to a larger digit when it occurs before the larger, so VIII is 5+1+1+1. However, where a smaller digit occurs after a larger digit it is subtracted, so IX is 10 - 1.

So, for example 28 could be XXVIII 10+10+5+1+1+1 or XX1X 10+10+10-1.

There are a few further rules but the above cover the majority of situations.

English Latin numerals Cardinal numerals
One I unus
Two II duo
Three III tres
Four IV quattuor
Five V quinque
Six VI sex
Seven VII/td> septem
Eight VIII octo
Nine IX novem
Ten X decem
Eleven XI/td> undecim
Twelve XII duodecim
Thirteen XIII tredecim
Fourteen XIV quattuordecim
Fifteen XV quindecim
Sixteen XVI sedecim
Seventeen XVII septendecim
Eighteen XVIII duedeveginti
Nineteen XIX uneviginti
Twenty XX viginti
Thirty XXX triginta
Forty XL quadraginta
Fifty L quinquaginta
Sixty LX sexaginta
Seventy LXX septuaginta
Eighty LXXX octoginta
Ninety XC nonaginta
One hundred C centum
One thousand M mille