De getallen 1 t/m 20 in Romeinse cijfers
I = 1, II = 2, III = 3, IV = 4, V = 5, VI = 6, VII = 7, VIII = 8, IX = 9, X = 10
Na het getal 10 wordt er herhaald.
XI = 11, XII = 12, XIII = 13, XIV = 14, XV = 15, XVI = 16, XVII = 17, XVIII = 18, XIX = 19, XX = 20