Yes its called a terminating decimal
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A rational number
There are two steps.First, divide the number by 10. This changes the length to units of centimeter instead of millimeter.Next, if there is a zero to the right of the decimal point, simply remove it and you have your new figure. If there is a digit other than zero, the number needs to be rounded. If the digit is between 1 and 4, the final value is rounded down by removing the decimal digit. If it between 5 and 9, the final value is rounded up by removing the decimal digit and adding 1 to the value.
The first digit after the decimal point.
Not necessarily.
Assuming that you mean a digit, it is a terminating decimal.