.39
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39 is XXXIX This represents X + X + X + IX = 10 + 10 + 10 + 9 = 39 The I before the larger value X indicates subtracting 1.
1 x 10 to the power of 2 is 1 x 102 or 10 x 10 or 100
In today's terms the above numerals represent 39
easiest way of explaining it is as follows 103 = 1 x 10 x 10 x 10 102 = 1 x 10 x 10 101 = 1 x 10 100 = 1
10 x 39 = 390