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1) The numeral reads from right to left.
2) The numeral with the greatest value should be placed at the right.
3) No numeral should be repeated more than three times in succession. Some old clocks and sundials use the numeral IIII to represent 4 but nowdays the numeral IV is used in order to comply with this rule.
4) I may preceed V and X but should not immediately preceed any numeral of higher value.
5) MMM represents 3000 but high values of thousands should be represented by a standard numeral to represent the number of thousands which is then placed within a pair of brackets, to indicate that the numeral should be multiplied by 1000. Or the numeral should have a horizontal bar placed above it, which also indicates that the numeral should be multiplied by 1000. Examples; 6000 = [VI], 91000 = [XCI], 7541 = [VII]DXLI

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Q: What are 5 rules when to use Roman numerals?
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