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Multiplying Roman Numbers

    XLII x LXI = ?
   
   
    XLII    LXI
-----------------------------------------------
half    *XXI    CXXII        double
     
       X    CCXLIV
      
    *  V    CDXXCVIII
      
      II    DCCCCLXXVI
      
    *  I    MDCCCCLII
-----------------------------------------------   

 Pick out the odd numbers on the
 halfed side and add the corresponding
 doubled numbers together and you
 get the answer. Oddnumber = *

 (Remark: Half of XXI is X and half of
 V is II and so be it.)

----------------------------------------------
     XXI => CXXII
     
       V => CDXXCVIII
          
       I => MDCCCCLII
      
          +
          ------------
              MMDLXII
----------------------------------------------

 So XLII x LXI = MMDLXII
 
 Nice things you can learn by
 paying attention while watching TV
 or surfing the Internet.
 
 42 x 61 = 2562 looks easier.