3, or 3.0 (centimetres).
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It is: 30mm = 3cm
54 cm2
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).
3cm, 3cm and 3cm respectively
27.9 IS a decimal number. You can tell it is a decimal number because it has a decimal point (.).