A rational number
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Yes its called a terminating decimal
The first digit after the decimal point.
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.
Assuming that you mean a digit, it is a terminating decimal.
Not necessarily.