A long time ago
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the arabic numbers were invented in the 10th centuary and replaced roman numerals in the 14th centuary
the question is not when it was invented but if it ever was invented in the first place...
indian numerals do not have zeor '0' digit, arabs invented 'zero' 0.
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.
Numerals are called Hindu Arabic, because they were invented by the Ancient Hindus during the 9th century, and then later adopted by the Arabic Persians in a book titled On the Use of Indian Numerals, which was brought to Western culture during the Middle Ages.