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 为1 V为5 X为10 L为50LI, 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回zjhpgyw:这是罗马数字！！！拜托。