I - 1 unus 
II - 2 duo 
III - 3 tres 
IV - 4 quattuor 
V - 5 quinque 
VI - 6 sex 
VII - 7 septem 
VIII - 8 octo 
IX - 9 novem 
X - 10 decem 
XI - 11 undecim 
XII - 12 duodecim 
XIII - 13 tresdecim 
XIV - 14 quattuordecim 
XV - 15 quindecim 
XVI - 16 sedecim 
XVII - 17 septendecim 
XVIII - 18 duodeviginti 
XIX - 19 undeviginti 
XX - 20 viginti 
XXI - 21 viginti unus 
XXII - 22 viginti duo 
XXVIII - 28 duodetriginta 
XXIX - 29 undetriginta 
XXX - 30 triginta 
XL - 40 quadraginta 
L - 50 quinquaginta 

1~10: I II III IV V VI VII VIII IX X 
11~20: XI XII XIII XIV XV XVI XVII XVIII XIX XX 
21~30: XXI XXII XXIII XXIV XXV XXVI XXVII XXVIII XXIX XXX 
31~40: XXXI XXXII XXXIII XXXIV XXXV XXXVI XXXVII XXXVIII XXXIX XL 
41~50: XLI XLII XLIII XLIV XLV XLVI XLVII XLVII XLIX L 
其中，I 為1 
V為5 
X為10 
L為50

LI, 51 
LV, 55 
LX, 60 
LXV, 65 
LXX, 70 
LXXX, 80 
XC, 90 
XCIII, 93 
XCV, 95 
XCVIII, 98 
IC, 99 
C, 100 
CC, 200 
CCC, 300 
CD, 400 
D, 500 
DC, 600 
DCC, 700 
DCCC, 800 
CM, 900 
M, 1000 
MC, 1100 
MCD, 1400 
MD, 1500 
MDC, 1600 
MDCLXVI, 1666 
MDCCCLXXXVIII, 1888 
MDCCCXCIX, 1899 
MCM, 1900 
MCMLXXVI, 1976 
MCMLXXXIV, 1984 
MCMXC, 1990 
MM, 2000