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Notwithstanding today's evaluation of Roman numerals the Romans themselves probably would have worked out the equivalent of the above numbers as XIIII, XVIII, XXIIII, XXXV and LVIIII respectively then added them up on an abacus counting device in the following manner:-

XIIII+XVIII = XXXII (14+18 = 32)

XXXII+XXIIII = LVI (32+24 = 56)

LVI+XXXV = LXXXXI (56+35 = 91)

LXXXXI+LVIIII = CL (91+59 = 150)

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