A decimal number is simply a way of representing a number in such a way that the place value of each digit is ten times that of the digit to its right. A decimal representation does not require a decimal point. So the required decimal representation is 1115, exactly as in the question.
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It is -1/1115.
1115 - 115 = 1000
I am not entirely sure what you mean, but 1115 is the same as 1115; any other number is NOT the same.
There are two possible answers: 1 and 1115 or 5 and 223
MCXV = 1115 M = 1000 C = 1000 X = 10 V = 5 Hence MCXV = 1000 + 100 + 10+ 5 = 1115.