It is a decimal number in which there is at least one non-zero digit after the decimal point (excluding an infinitely repeating 9s).
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xxx is a fractional number in decimal form and there is no sensible way to represent it as a whole number.
0.535 is a fractional number in decimal form and there is no sensible way to turn it into a whole number.
To convert the decimal 0.89 to a decimal, you simply write it as is: 0.89. In decimal form, the number to the left of the decimal point represents the whole number part, and the digits to the right of the decimal point represent the fractional part. So, 0.89 is already in decimal form.
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).
0.8 is a fractional number in decimal form and there is no sensible way to represent it as a whole number. The whole part of it is 0.