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It didn't. IV has always been the Roman numeral; 4 is an Arabic numeral. the western world adopted the Arabic numbers because it is easier to use one symbol for each number, rather than mixing several together.
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Related questions
What is the value of the Roman numeral IV?
The Roman numeral IV represents the number 4
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P is not a Roman numeral. IV is the Roman numeral for 4.
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What roman numeral is iv?
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What does the Roman numeral IV stand for?
IV = 4
How do you say 4 in roman numerals?
The Roman numeral for 4 is IV.
What is roman numeral for 4?
IV
What is Roman Numeral 4?
IV
What is 4 as a Roman Numeral?
IV
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