Smaller numerals are subtracted from larger numerals that are written to their right.
So IV = 4, and so on.
(
_Felix 's school of dance and occult sciences,
Sat 11 Mar 2006, 17:11,
archived)
Coo...
The things you learn! :o)
(
Mr Bigglesworth is my master,
Sat 11 Mar 2006, 17:20,
archived)