100
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100
When rounding 127 to the nearest hundred, you look at the digit in the tens place, which is 2. Since 2 is less than 5, you round down. Therefore, 127 rounded to the nearest hundred is 100.
130
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 decimal representation of 127 is 127, exactly as in the question.
The answer will depend on the degree to which the number is rounded. Without any indication of that, it is not possible to answer the question sensibly.