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 197, exactly as in the question.
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197% := 197/100= 1 97/100
197/25 is already in its simplest form and as a decimal it is 7.88
197 in Roman numerals is CXCVII.
0.197 = 197/1000, which is in its simplest form.
0.788 = 788/1000 = 197/250