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How would you multiply 99 by 19 in Roman numerals showing work with explanations?
With great difficulty because under the present rules now governing the Roman numeral system the modern conversion of 99 and 19 into Roman numerals is now considered to be XCIX and XIX but there exist historical evidence to show that the ancient Romans would have worked out the aforementioned Hindu-Arabic numerals as LXXXXVIIII and XVIIII which can be abridged to IC and IXX respectively thus facilitating the product of the equivalent of 99 and 19 as follows:-
-I[-I+C]+XX[-I+C] = I-C-XX+MM => XXCMMI => MDCCCLXXXI
Which means: -1(-1+100)+20(-1+100) = 1-100-20+2000 => 1881
Note that in mathematics -(-1+100) changes to 1-100 and that the Roman numerals of XXCMMI is equvalent to 2001-120 = 1881 which is an abridged version of MDCCCLXXXI but both retaining their original values.
QED
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How do you multiply in roman numerals?
With a lot of pain!
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When a bar is written over a letter the value of the latter is multiplied by?
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What inspired the roman numerals?
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