How do you express 6003 in Roman numerals?

Answer 1

MMMMMM III. Normally, you would put the line over it to multiply it by 1,000, but that is only if it is greater than or equal to 10,000

Improved Answer:

(VI)III = 1000*6+3 = 6003

Also it can be VMIII but with an horizotal bar above the first numeral V.

Numerals in brackets or with a bar above them indicate multiplication by a thousand.