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 为1

V为5

X为10

L为50

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

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