That would be the Hindus. The Western Arabs introduced the system to Europe, hence the term Hindu-Arabic numerals.
The numerals were introduced into Europe around the 10th century.
In medieval Western Europe the numeracy system was Roman then in the Middle Ages the Hindu-Arabic numeracy system was introduced.
The Roman numerals LXVII=67 in Hindu Arabic numerals.
The Roman numerals of XX are the equivalent of 20 in Hindu-Arabic numerals
That would be the Hindus. The Western Arabs introduced the system to Europe, hence the term Hindu-Arabic numerals.
The numerals were introduced into Europe around the 10th century.
Because they originated from India and Arabic traders introduced them into Western Europe during the Middle Ages.
In medieval Western Europe the numeracy system was Roman then in the Middle Ages the Hindu-Arabic numeracy system was introduced.
Hindu Arabic numerals are the ones we use. 39 is already in Hindu-Arabic numerals.
The Roman numerals LXVII=67 in Hindu Arabic numerals.
The Roman numerals of XX are the equivalent of 20 in Hindu-Arabic numerals
The Roman numerals of CCX are the equivalent of 210 in Hindu-Arabic numerals.
The Roman numerals of DCCC are the equivalent of 800 in Hindu-Arabic numerals
In Hindu-Arabic numerals, DCLXII would be 662.
437 is already in Hindu-Arabic numerals
The Roman numerals of XXVIII are the equivalent of 28 in Hindu-Arabic numerals