It is simply 127.0 as a decimal number
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127/1000 = 0.127
It is 127 in decimal numbers.
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 127. If 127 mm were to be expressed in terms of some other unit of length then that unit of length should have been specified in the question.
-127 or -128
7.5 is a decimal.