If the Roman had used the same numbers which are used in the Arabic number system then they would have been using the Arabic number system. The whole point is that they used a different system.
The other half of the whole point is that the Roman Empire fell before the Arabs and Hindus developed their number system. The Romans 'borrowed' their system from the Etruscans; they could not borrow what had not yet been invented.
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A) Arabic numerals are in numbers whereas Roman numerals are in letters.B) Even if Roman numerals are in letters the symbols are easier to understand, despite the fact that Australians and Americans and most probably you write numbers using the system of Arabic numerals.C) The system of Roman numerals was invented before the system of Arabic numerals, but people use the system of Arabic numerals to write more frequently.
The Arabic numbers for 1859 are 1859, the Roman numerals for 1859 are MDCCCLIX.
Hindu-Arabic numerals are the numbers that we now use everyday instead of Roman numerals and they are: 0, 1, 2, 3, 4, 5, 6, 7, 8 and 9
1-10 you write with letters and 11+ you write with numerals. Your welcome!! ;)
Arabic numbers need less digits to represent large numbers (in general). When doing arithmetic operations on the numbers, Arabic is easier because of the place values can line up.