Save yourself the trouble and convert the numbers to arabic numbers (the numbers we usually use).
See answer to question: ' How do you add together 1666 and 1999 in two different ways using Roman numerals'
MIM + MMXIV = MMMXIII or MMCXCIX + MMXIII = MMMXIII There is only one way to write the solution (3013)
XLVII represents -10+57 = 47
because it's too complicated to calculate with roman numerals. eg 11 * 9 = 99 => XI * IX = XCIX
Roman numerals are entirely inappropriate for doing such calculations. I believe the people in Roman times did such calculations on an abacus or something similar - which is basically similar to converting them to the Arabic numbers we use. If you really want to do it in Roman numerals - which is basically NOT a good idea - you would have to keep the thousands, hundreds, etc. separate, and handle carry (for addition) and borrowing (for subtraction).
See answer to question: ' How do you add together 1666 and 1999 in two different ways using Roman numerals'
MIM + MMXIV = MMMXIII or MMCXCIX + MMXIII = MMMXIII There is only one way to write the solution (3013)
XLVII represents -10+57 = 47
Because Hindu-Arabic numerals contains a zero symbol which makes arithmetic a lot easier to calculate whereas Roman numerals have no zero symbol thus making arithmetic more difficult to calculate.
because it's too complicated to calculate with roman numerals. eg 11 * 9 = 99 => XI * IX = XCIX
Roman numerals are entirely inappropriate for doing such calculations. I believe the people in Roman times did such calculations on an abacus or something similar - which is basically similar to converting them to the Arabic numbers we use. If you really want to do it in Roman numerals - which is basically NOT a good idea - you would have to keep the thousands, hundreds, etc. separate, and handle carry (for addition) and borrowing (for subtraction).
Etruscan numerals. The Etruscans who once ruled the Romans first conceived the idea of representing numerals for different numerical quantities.
3024
151,200
Numerals are different Numbers as for hieroglyphs are symbols used to represent numbers.
MCMLXXVII
Numerals are symbols which are used to write numbers; for example, the Arabic numerals which we use in most situations are simply the ten digits, 0,1,2,3,4,5,6,7,8 and 9. Numbers are many different quantities which can be symbolized by using numerals, such as 657,899.034 or five and a half, or the square root of 2, etc.