S as a Roman numeral is equivalent to a 1/2 or 0.5
here you go.In roman`s numberals its looks like this X-10 and XI-11
50
MM = 2000
XXI = 21
XLVII is the equivalent of -10+57 = 47
In roman numberals it means MCMLXXI. In Arabic numerals it means 1971.
1736
MCMLXXXXII
CLXXXIX
1607
40032
2000 = MM