Today's rules of converting Hindu-Arabic into Roman numerals are confusing to say the least.
Read any reference books regarding the history and evolution of mathematics and what they all have in common is that the Romans were not well inclined to mathematics because their numeral system was cumbersome and almost impossible to perform arithmetical operations.
But in fact the Romans were excellent mathematicians and their numeracy system was by far the most advanced in the known ancient world and an advantage it has over the numeracy system we use today is that it doesn't need a nought figure for place value purposes.
Today most people find it difficult to convert Hindu-Arabic numerals into Roman numerals. This is because the way we write out Roman numerals today is different to the way that the Romans did themselves because today's rules governing the Roman numeral system were introduced during the Middle Ages and that was centuries after the decline of the Roman Empire.
Take for instance the number 1999 today it is written out as MCMXCIX but the Romans themselves probably wrote it out as IMM and to multiply it by 10 would work out as X(XX) which is -10+20,000 =19,990
So where do you start when you try to multiply MCMXCIX by 10?
This question has already been answered in detail under the heading: "What are the rules in changing hindu-arabic into roman numerals"
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Under today's rules now governing the Roman numeral system the Roman numeral for 54 is LIV but the ancient Romans would have notated it as LIIII
Under today's rules now governing the Roman numeral system CXCIX represents 199
MCMLX under today's rules governing the Roman numeral system they represent the year 1960
This question has already been answered in detail under the heading: "What are the rules in changing hindu-arabic into roman numerals"
Under today's rules now governing the Roman numeral system the given numeral is equivalent to 289
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Under today's rules now governing the Roman numeral system the Roman numeral for 54 is LIV but the ancient Romans would have notated it as LIIII
Under today's rules now governing the Roman numeral system CXCIX represents 199
MCMLX under today's rules governing the Roman numeral system they represent the year 1960
Under today's rules now governing the Roman numeral system 946 as a Roman numeral is CMXLVI but the ancient Romans would have notated it quite differently
Under the rules now governing the Roman numeral system 1949 is deemed to be MCMXLIX as a Roman numeral but the ancient Romans would have notated it as MDCCCCXXXXVIIII
Under today's rules now governing the Roman numeral system MCMLI is equivalent to 1951
Under the rules now governing the Roman numeral system 1963 as a Roman numeral is MCMLXIII but the ancient Romans would have notated it quite differently
Under today's rules now governing the Roman numeral system the Roman numeral of MCMLXV is equivalent to 1965 as an Hindu-Arabic numeral
Under todays rules: DXC