Because they originated from the Indian subcontinent then across Arabia and then into Western Europe during the Middle Ages thus replacing Roman numerals that was the numeracy system being used at the time.
Because they were used in Ancient India. The Arabs learned them from here and spread to the world. That's why in the beginning the Europeans called them Arabic numbers but the arabians itself called them Hindu numbers. So now they are jointly called the Hindu-Arabic numbers.
Because that was the region of the world where Hindu-Arabic numerals originated from.
It is the Hindu-Arabic numeral system.
In todays notation of Roman numerals it represents 1988 in Hindu-Arabic numerals
The numbers we use today
There is no system called "Arabic numbers". XII can be defined by a set of Arabic NUMERALS, but not by a single character.Improved Answer:-The Roman numerals of XII equals 12 in Hindu-Arabic numerals.
Hindu/Arabic numbers are the system of numbers which are used in most countries of the world. 192 is a Hindu/Arabic number.
In todays modern configuration of Roman numbers it is equivalent to 348 in Hindu-Arabic numerals
Hindu Arabic Numerals use numbers but Roman numerals use symbols.
They are known as Hindu-Arabic numerals
numbers
The Roman numerals of MMDCCLXXII are equivalent to the Hindu-Arabic numerals of 2772