39 is XXXIX
This represents X + X + X + IX = 10 + 10 + 10 + 9 = 39
The I before the larger value X indicates subtracting 1.
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XXXIX is the equivalent of 39 in the Roman Numerals.
XXXIX
39
In today's terms: XXXIX
In todays modern usage of Roman numerals it is: XXXIX But the ancient Romans probably worked it out quite differently