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XC is the usual convention (X =10 subtracted from C = 100).

More rarely seen is LXXXX (L=50 and XXXX = 40)

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8y ago

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More answers

90 = XC LXXXX (90) or XC (100-10)

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16y ago
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XC or LXXXX

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15y ago
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XC.

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14y ago
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Q: 90 is what in roman numerals?
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