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Quite easily because each of the 7 numerals represented a certain value. The Romans even had the equivalent of a modern day calculator to do their sums it was called an abacus device.

The 7 numerical values: M=1000, D=500, C=100, L=50, X=10, V=5, I=1

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Q: Because the Romans use letters for their numerals how do they do sums?
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