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The name of such a number is a decimal number. The digits after the decimal point represent tenths, hundredths, thousandths, and so on.
That depends on what kind of number name you are given: an improper fraction? A decimal? A percentage? ...
No. A whole number is a number with no fractional (decimal) part. Therefore a decimal number can not be a whole number. Another view: 35.0 is a whole number AND a decimal. The fact that a number is a decimal does not automatically require it to have a fractional part. Even 35 is a decimal number (without a decimal point).
Other than a negative number, there is no special name.
The decimal equivalent of -12 is simply -12. In decimal form, negative numbers are represented with a minus sign preceding the number itself. Therefore, -12 in decimal form is -12.