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by paradoja 5616 days ago
You may have a point, but I still find easier to do

         111
 948      948
 289  =>  289
 ---      ---
         1237
than

CMXLVIII plus CCLXXXIX => CMCCXLLXXXIXVIII => MCLLXXIXVIII => MCCXXXVII

but it may be that it's because what I'm used to.