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The Hindu-Arabic system was positional, meaning numerals had different values based on where they were in the number (we use this today: 654 is a different number from 546). It was also decimal, i.e. based on 10, which is also what we normally use today.

The Roman system uses combinations of seven letters of the alphabet to indicate values. Although the optional use of subtractive notation can lead to some positional aspects (VI is different from IV), numbers are conventionally written from largest to smallest, i.e. MDCLXVI.

The Roman system never had a zero; the Hindu-Arabic system gained a zero in the 10th century because the positional system needed a way to indicate when there was no numeral in that position.

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Q: What is a comparison between Hindu-Arabic system and the Roman numeral system?
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