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How to translate 1998. 10.20 into Roman numerals?

1998.MCMXCVIII

10.Ⅹ

20.xx

age

MCMXCVIII

M = 1000

C = 100

X = 10

V = 5

I = 1

Meters (centimeters) (XC) five (three)

= 1000 + ( 1000 - 100) + ( 100 - 10) + 5 + 1 + 1 + 1

= 1000 + 900 + 90 + 5 + 3

= 1998

ⅹ- 10、ⅺ- 1 1、ⅻ- 12、XIII- 13、XIV- 14、XV- 15、XVI- 16、XVII- 17、XVIII- 18、XIX- 19、XX-20、XXI-2 1、XXII-22