No you don't; if the sentence starts with a number then that number counts as the first word for the purpose of capitalization rules. Example: 1990 was a good year.
Yes, if your article heading starts with a numeral, the word that follows should generally start with a capital letter. This is a common style convention to maintain consistency and readability in your writing.
Yes it should.
No, typically a comma is not used before "III" when it follows a name or title.
In an outline, you should capitalize the first word of each main heading (e.g., Roman numeral I, A, 1) and any proper nouns. Subheadings typically use lowercase letters, except for any proper nouns included within them.
MCMXLIII is the Roman numeral for 1943.
The ordinal numeral 20th is spelled twentieth.
The numeral 460 is written out "four hundred and sixty."
The Roman numerals for 1 is I
A roman numeral in parentheses follows the name of the metal... apex
The Roman Numeral for million is a capital M with a bar over it. NOT to be confused with their numeral for thousand which is only a capital M with no bar.
With capital letters.
XVI (10+5+1)
'lxxxv' is not a Roman Numeral. Roman numerals are written as CAPITAL letters. It should be LXXXV = 85.
VII, which is the capital v followed the capital i, twice.
The Roman numeral "lxix" is equal to 69 in Arabic numerals.
That would be III (three capital I's).
L is 50. See link for a good article.
Type a double capital I as in II
27,226 = (XXVII)CCXXVI Usually in capital letters