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Latin numeracy is the same as Roman numerals and under the modern rules now governing the Roman numeral system the equivalent of 549 when converted into Roman numerals is now considered to be DXLIX but there exist historical evidence to suggest that the ancient Romans would have worked it out on an abacus counting device as DXXXXVIIII which can be abridged to IDL thus expediating the speed and ease of the required calculations as follows:-

MDCCLXXVI+IDL = MMCCCXXV => 1776+(550-1) = 2325

MDCCLXXVI+DXXXXVIIII = MMCCCXXV => 1776-449 = 2325

MDCCLXXVI-IDL = MCCXXVII => 1776-(550-1) = 1227

MDCCLXXVI-DXXXXVIIII = MCCXXVII => 1776-549 = 1227

QED

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Q: How would you work out 1776 plus 549 in two different ways and 1776 minus 549 in two different ways but doing all four calculations entirely in Roman numerals with explanations?
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See answer to question: ' How do you add together 1666 and 1999 in two different ways using Roman numerals'


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