The Hindu-Arabic numeral system originated from the Indian subcontinent and its importance was that it included a symbol for zero which made arithmetical calculations a lot easier to work out and the symbols as we know them today are: 0 1 2 3 4 5 6 7 8 and 9
The Roman numerals LXVII=67 in Hindu Arabic numerals.
dcccxiii in Roman numerals is equivalent to 813 in Hindu-Arabic numerals.
The Roman numerals of XXVIII are the equivalent of 28 in Hindu-Arabic numerals
Hindu Arabic numerals are the ones we use. 39 is already 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 Roman numerals of XX are the equivalent of 20 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
1 is similar betweeen Roman and Hindu arabic numerals
It is already in Hindu-Arabic numerals but if you mean in Roman numerals then it is written as: CXXIII
The given Roman numerals can be simplified to CLXVI which is the equivalent of 166 in Hindu-Arabic numerals