14
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The Romans themselves probably wrote out 14 as XIIII but in today's modern notation it is written as XIV.
9 out of 14
The best classification is that it is "the real number -14". Any other classification is less good because it will be less precise: some other number will also qualify.
The Roman numeral XIV represents the number 14
Since 19 is a prime number, 14/19 is already written as an improper fraction in its simplest form.