Use two 'I's - II
On an ordinary keyboard you can simply use the capital letters; I, V, X, L, C, D and M to write most Roman numerals.
By using matchsticks to make Roman numerals we can have: VII - VII = O By removing one matchstick we have: VII - VI = I
There are two ways: One; you can search them on the web and copy and paste them to whatever you are writing or Two; you may go on Microsoft Word and click "insert symbol" and look for the Roman numerals
Roman numerals do not make provision for decimals. 22 is XXII
None. There are no vowels among the Roman Numerals.
4x9=36 OR XXXVI Roman Numerals
By using matchsticks to make Roman numerals we can have: VII - VII = O By removing one matchstick we have: VII - VI = I
8D Nonono, Roman Numerals were a counting system. Just like you can't make letters with 123..., you can't make letters for numerals.
DLXXIV
1109
DCCCXXXII
MMXIII