It is: 4/16 = 0.25
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Not necessarily: for example, consider 0.5 * 4 = 2
.4
As a decimal, it is 4. This is an integer and there is not a sensible way to represent it as a mixed number.
It is a 4.
4 cm, exactly as in the question. 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.