The Indians started the Hindu numeral system. We call it the Hindu-Arabic system because it was the Arabs of North Africa who brought the system to Europe.
The Roman numerals LXVII=67 in Hindu Arabic numerals.
The Roman numerals of XXVIII are the equivalent of 28 in Hindu-Arabic numerals
dcccxiii in Roman numerals is equivalent to 813 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 Hindu Arabic number system was in fact started by Indians, back then known as Brahmi Numerals. They then slowly evolved to become Hindu Arabic numerals.
The Roman numerals LXVII=67 in Hindu Arabic numerals.
The Roman numerals of XXVIII are the equivalent of 28 in Hindu-Arabic numerals
dcccxiii in Roman numerals is equivalent to 813 in Hindu-Arabic numerals.
Hindu Arabic numerals are the ones we use. 39 is already 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
The given numerals are an invalid arrangement of Roman numerals and so therefore there is no equivalent of them in Hindu-Arabic numerals.
437 is already in Hindu-Arabic numerals
The given Roman numerals can be simplified to CLXVI which is the equivalent of 166 in Hindu-Arabic numerals
1 is similar betweeen Roman and Hindu arabic numerals