The Hindu-Arabic numeral system originated in India and was based on the Brahmi numerals that can be traced back to Budhist inscriptions from the 3rd century BCE. However, it wasn't until the 9th Century CE that the digit 0 was first seen. The system was base-9 until that time, but was nonetheless positional, using spaces to indicate no value.
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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.