How about: LIII+XXVI = 79 which is 53+26 = 79
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The Roman numeral for 50 is L, and the Roman numeral for 10 is X. So, 50 (L) plus 10 (X) plus 10 (X) plus 5 (V) plus 1 (I) equals 76 (LXXVI). There is no single Roman numeral for 79.
I would convert them back into Hindu-Arabic numerals, do the addition and then convert the answer to Roman numerals.
MD in Roman numerals adds up to 1500. M represents 1000 and D represents 500, so when combined, they equal 1500.
They could be Roman numerals that add up to 1000: DD = M
If you mean CD plus DC then in Roman numerals they add up to M meaning 400 plus 600 = 1000
Roman numerals can only go up to 4,999.