For herdsmen to keep a check on how many cattle or livestock they had.
Counting, particularly for organizing their armies.
The Etruscans did and they once ruled the Romans.
They were developed using a Roman system that worked out for pretty much all of the Romans
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.
The Mayan number system is vigesimal (based on twenties)The Roman number system is decimal (based on tens)
Arabs developed the number system (0,1,2,3,4) we use now. The Roman system (I, II, III, IV, V) wasn't as good, because there was no zero.
Roman Numerals
The ancient Egyptians used the decimal number system.
The Roman numeral system was formed by the ancient Etruscans.
They have no zero.
It is zero because it's not needed in the Roman numeral system.
No, the Roman Numerals are a based less number system.
Roman numerals were developed by the ancient Romans in the 3rd century BC. They were used as the primary number system in the Roman Empire and remained in common usage until the Middle Ages.